News Feeds

While perusing the Bad Gray Lady this morning, I saw two headlines that, in light of what I knew about events in Gaza and Lebanon, looked dubious. Sure enough, the headlines and the news below them gave a distorted view of the situation. Here’s the first one (click to read, or find article archived here):

Note first the order of events: Israel blacks Gazans from north while accusing Hamas of a cease-fire breach.  The order of events should have been reversed, with the headline saying “Israel accuses Hamas of Cease-Fire Breach, blocks Gazans from North.” That may seem a trivial difference , but I’ve seen too many headlines with Israel identified first as the perp, with the stated reasons for their actions given second.

But the lack of explanation for what’s happening is much more important. The real situation is that Israel and Hamas agreed to a cease-fire in which all civilian hostages were to be released first, and, yesterday at noon Israeli time, Hamas was also to provide Israel with a complete list of the hostages they had or knew about, specifying whether they were living or dead.  Hamas did neither; they are still not releasing one civilian woman (she was held by Palestinian Islamic Jihad, but Hamas is a partner organization and could easily have arranged for the woman’s release). The four women released yesterday were in the IDF. The NYT notes this further down:

The office of Prime Minister Benjamin Netanyahu of Israel said that it would not allow Gazans to head north “until the release of the civilian Arbel Yehud has been arranged,” leaving the timing of the troop withdrawal and the residents’ return unclear.

And here’s another violation described by the Jerusalem Post:

Hamas has not yet provided Israel with the list revealing the status of the hostages held in Gaza captivity, which it was obligated to provide by Saturday under the ceasefire agreement.

According to a Walla report citing Israeli officials, the list was expected to include details on how many of the hostages remaining in Hamas captivity are still alive and how many are deceased.

An Israeli official reportedly said that failure to provide the list by the end of the day would be another violation of the agreement by Hamas.

Hamas could not explain either of these violations of the agreement. It’s clear that they are toying with Israel and playing psychological games that of course are deeply injurious to the hostages’ friends and families. This is why Israel did not withdraw from northern Gaza or allow residents to return home. (Note that Israel still has not fired on bullet.) The “blocking” is Israel’s nonviolent response to the actions of Hamas, the party that first violated the cease-fire.

I don’t think this bodes well for a continuing peace in the region, which, at any rate, I don’t think will be permanent so long as Hamas runs Gaza.

Here is the second headline about doings further north. Click to read, or find it archived here:

And an excerpt (bolding is mine)

At least 15 people were killed and more than 80 injured by Israeli forces on Sunday in southern Lebanon, Lebanese officials said, as the 60-day deadline for both Hezbollah and Israel to withdraw from the south expired and thousands of Lebanese displaced by the war poured onto roads leading south back to their homes.

The agreement, which was signed in November and halted the deadliest war in decades between the two sides, stipulated that both Hezbollah and Israel withdraw, while the Lebanese Army and U.N. peacekeepers would be deployed in force to secure the area. Negotiators had hoped the cease-fire deal would become permanent, returning a measure of calm to a turbulent region.

But as the deadline passed on Sunday, a very different scenario was taking shape.

Israeli forces remained in parts of southern Lebanon in violation of the cease-fire agreement, stoking fears of a sustained Israeli occupation and renewed hostilities between Israel and Hezbollah. Israeli officials warned Lebanese not to return to their homes in many towns and villages in the south.

“In the near future, we will continue to inform you about the places to which you can return,” Avichai Adraee, the Arabic spokesman of the Israeli military, posted on social media on Sunday morning. “Until further notice, all previously published instructions remain in effect.”

Lebanon’s Health Ministry said that those killed and injured on Sunday morning had been trying to enter their villages along the border when they were attacked by Israeli forces. Residents of some southern towns had called for their neighbors to gather early Sunday morning and head to their homes in a convoy, despite the warnings from Israel. The Lebanese military said it was accompanying civilians returning to several border towns to try to ensure their safety. The military said in a statement that a Lebanese soldier was among those killed by Israeli fire.

What is not explained: What Israel and Lebanon agreed to was that Israel would occupy the region between their northern border with Lebanon and the Litani River, and then would withdraw back into Israel after the Lebanese Army (note: there is one, and it’s not Hezbollah), in concert with the UN army forces of UNIFIL, would destroy all of Hezbollah’s weapons and facilities between the border with Israel and the Litani River. Until then, villages in that area would be evacuated (Israeli villages south of the border with Lebanon have also been evacuated, displacing 80,000 people).

Of course UNIFIL and the Lebanese Army have done little or nothing, and Hezbollah, despite the agreement, will not withdraw north of the Litani River; armed Hezbollah fighters remain in the forbidden region while UNIFIL and the Lebanese Army does bupkes.  The Israelis fired on a group of people marching back to their homes in violation of the agreement, accompanied by armed people; this was perceived as a threat [see below].

At any rate the bolded text above implies that Israel was violating the cease-fire agreement while Lebanon adhered to it. That is a falsehood. Lebanon first violated the cease-fire agreement big-time, and in response Israel did not withdraw.

From the Times of Israel:

The Lebanese health ministry said 15 people had been killed, including a Lebanese soldier, and some 83 had been wounded by IDF fire in southern Lebanon since the morning.

The crowds appeared to be largely made up of Hezbollah supporters. Hezbollah’s al-Manar television, broadcasting from several locations in the south, showed footage of residents moving toward villages in defiance of Israeli orders, some holding the terror group’s flag and images of Hezbollah fighters killed in the war, as well as slain Hezbollah chief Hassan Nasrallah.

An Israeli military official told reporters that hundreds of Lebanese, among them Hezbollah operatives, tried to reach villages in southern Lebanon while carrying out “provocations.”

The official said the military had prepared for civilians attempting to reach the border villages at the end of the 60-day truce, despite its warnings.

The IDF said it opened fire on suspects who approached troops still deployed in southern Lebanon and who posed an “imminent threat.” Troops also detained several suspects, according to the military.

Here, from Wikimedia, is a map showing the Litani River and the area south of it before one gets to the Israeli border (dark grey line). That is the region that was subject to the truce agreement.

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In both cases above, Gaza and then Lebanon violated a cease-fire agreement with Israel, and Israel did not violate that agreement–until the terrorists (and the UN and Lebanon) violated the agreement.  Yet somehow the NYT makes Israel look responsible here rather than terrorists violating a cease-fire agreement. Such is mainstream journalism. In Gaza, for instance, if Hamas would just let the Israelis go as agreed, the cease-fire would be obeyed by Israel, which already has released the hundreds of Palestinian terrorists from Israeli jails per the agreement.

Biologist John Avise has sent us another batch of butterfly photos. They are below: John’s IDs are indented, and you can enlarge the photos by clicking on them.

Butterflies in North America, Part 7 

This week continues my many-part series on butterflies that I’ve photographed in North America.  I’m continuing to go down my list of species in alphabetical order by common name.  The intent of this series is to introduce (or remind) WEIT readers about the diversity and beauty of this continent’s Lepidopterans.

Funereal Duskywing (Erynnis funeralis):

Gabb’s Checkerspot (Chlosyne gabbii):

Eastern Giant Swallowtail (Papilio cresphontes), topwing:

Eastern Giant Swallowtail, underwing:

Golden Hairstreak (Habrodais grunus):

Gray Comma (Polygonia progne), topwing:

Gray Comma, underwing:

Gray Hairstreak (Strymon melinus) male topwing [JAC note: the three hairstreak photos seem to show that a “false head”, complete with antennae, has evolved at the rear end of the wings, surely to attract predators to the “wrong” part of the body. Note how inconspicuous the vulnerable head is!]

Gray Hairstreak, female topwing:

Gray Hairstreak, female underwing:

Great Southern White (Ascia monuste), topwing:

Great Southern White, underwing:

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our Solar System has been well known. It’s responsible for the orbits of the planets and their satellites but there are other forces that have shaped our planetary neighbourhood. A new paper has been released where an astronomer discusses how recoiling ice from comets can push them around and how the radiation pressure from the Sun drives material outwards. There are also relativistic effects too that can cause particles to spiral inward toward the Sun. 

Gravity is the force that governs the structure and motion of the solar system, keeping celestial bodies together in a cosmic dance. The Sun, with its immense mass, generates the strongest gravitational pull, anchoring planets, asteroids, comets, and other objects in orbit around it. Each planet’s orbit results from the balance between its velocity and the Sun’s gravitational force, creating elliptical paths described by Kepler’s laws of motion. Similarly, moons remain in orbit around their host planets due to the gravitational forces exerted by their parent planet. Gravity not only maintains the stability of these orbits but also influences phenomena like tides on Earth, caused by the Moon’s gravitational pull.

View of Moon limb with Earth on the horizon,Mare Smythii Region. Earth rise. This image was taken before separation of the LM and the Command Module during Apollo 11 Mission. Original film magazine was labeled V. Film Type: S0-368 Color taken with a 250mm lens. Approximate photo scale 1:1,300,000. Principal Point Latitude was 3 North by Longitude 85 East. Foward overlap is 90%. Sun angle is High. Approximate Tilt minimum is 65 degrees,maximum is 69. Tilt direction is West (W).

In the paper authored by David Jewitt from the University of California he explores other forces that shape our Solar System. Gravity certainly describes the motion of planetary mass bodies but there are other forces that impart forces upon smaller bodies that are susceptible to their effects. These forces include, but are not limited to recoil (as per Newton’s third law of motion that every action has an equal and opposite reaction,) torque from mass loss, radiation pressure and more. 

The aim of the paper is to offer a simple yet informative overview of the various non-gravitational forces at play in the Solar System. There are references to relevant applications from existing papers and publications, presenting them in a way that is accessible to non-specialists. An important point to note is that the paper assumes that all orbits are circular, whereas real bodies are not perfectly spherical and orbits are not perfectly circular. The author asserts that these approximations ensure that rough estimates of the magnitudes of forces can still be achieved. 

Among the non-gravitational forces considered in the paper, the largest by far is the recoil produced by the sublimation of ice on comets and asteroids. The heat from the Sun causes the ice to immediately turn into a gas rather than melt to a liquid, this is the sublimation process. Like a bullet leaving a gun however, and in accordance with Newton’s laws, when the ice sublimates, the escaping volatile gasses will carry momentum and exert a recoil force on the body. The process of sublimation depends largely on temperature and acts in the anti-solar direction. 

Comet image from Hubble

Related to the appearance of comets is another force, radiation pressure, that shapes their distinctive tails. It’s the force exerted by light when photons transfer momentum to an object such as cometary dust and gas pushing them away. The pressure depends on the intensity of the radiation and the object’s reflectivity, with more reflective objects experiencing greater force. Though small, radiation pressure can shape comet tails and gradually alter the orbits of small bodies in the solar system.

The Sun releases a steady stream of charged particles called the Solar Wind. When it strikes unprotected surfaces like asteroids or the Moon, it can change the chemistry and even create water molecules. Image Credit: NASA’s Goddard Space Flight Center/Mary Pat Hrybyk-Keith

Source : Non-gravitational Forces in Planetary Systems

The post There’s More Than Just Gravity at Work in the Solar System appeared first on Universe Today.

Don’t know about you but when I think of Earth my mind is filled with the diversity of life and the rich flora and fauna. In reality, about 99% of Earth is uninhabitable; deep underground places with high pressure and temperature where even the toughest bacteria cannot survive. There are places though where life thrives from tiniest toughest bacteria to the largest elephant. Then there are places that are habitable but devoid of life; lava flows are a great example and the space between microbes. A paper recently released looks at these uninhabited, habitable areas and wonders what we may learn as we search for life in the Universe.

Life on Earth has taken millions of years to evolve to the state we see today and has invaded nearly every corner of the planet. That is, except those places where the environment is so extreme that even the toughest extremophile cannot survive. These regions include places like the Atacama Desert in Chile, one of the driest places on Earth, where rainfall is so rare that even microbial life struggles to survive. Similarly, parts of Antarctica’s dry valleys feature subzero temperatures, minimal liquid water, and high salinity in some soils, creating an environment hostile to most life forms. It raises interesting questions and perhaps pose limitations on life’s ability to survive. 

The rocks seen here along the shoreline of Lake Salda in Turkey were formed over time by microbes that trap minerals and sediments in the water. These so-called microbialites were once a major form of life on Earth and provide some of the oldest known fossilized records of life on our planet. NASA’s Mars 2020 Perseverance mission will search for signs of ancient life on the Martian surface. Studying these microbial fossils on Earth has helped scientists prepare for the mission. Image Credit: NASA/JPL-Caltech

We can learn a lot from life on Earth as we hunt for live elsewhere in the Universe. At the moment, there is just one place in the cosmos where we know life has evolved, that’s on Earth. A paper recently authored by Charles S Cockell from the University of Edinburgh explores what we might learn from the inhospitable places on Earth and how that might inform our search for extraterrestrial life. The paper discusses places where active microorganisms cannot be found in particular those places where the physical and chemical conditions are not far from areas that support life. 

The physical spaces where microbes cannot sustain the essential metabolic activity or even reproduce can be categorised into two groups: those with uninhabitable conditions and those with habitable but uninhabited spaces, also known as uninhabited habitats. You might need to read that a few times but it does make sense! Uninhabitable conditions occur in environments where life cannot exist due to extreme factors like intense heat, cold, salinity, or acidity. In contrast, uninhabited habitats are environments that are theoretically capable of supporting life but remain unoccupied, often due to barriers to colonisation or the absence of necessary organisms. The paper draws a strong differentiation between these ‘vacant niches.’

Lava cooling after an eruption. This rock has an entrained magnetic field fingerprint from the time it formed. Credit: kalapanaculturaltours.com

These uninhabited habitats, which form on both macroscopic and microscopic scales through diverse processes, offer opportunities for scientific investigation. They can act as negative control environments, helping to reveal how living organisms influence geochemical processes, and how they can provide a framework for studying processes like microbial succession and community development. Despite their potential significance, the occurrence of these habitats in environments at the physical and chemical extremes of life remain poorly understood.

As we continue our search for life across the universe, we may find many more locations like these. Doing so will help to expand our understanding of the distribution of habitable conditions and the potential for life across the universe. They may offer insights into the processes that make a location suitable for life, as well as the factors that have prevented life from arising or persisting there.

Source : Where the microbes aren’t

The post There are Places on Earth Which Could Have Life, but Don’t. What Can We Learn? appeared first on Universe Today.

The Einstein Probe was launched in January 2024 to look at X-ray transients, among other things. Its power comes from its Wide-field X-ray Telescope (WXT), which can capture 3600 square degrees of the sky in a single go. That’s an area 18,000 times the apparent area of the Moon. That is a huge patch of astronomical sky, so it’s not surprising that just two months later the probe saw a 17-minute burst of soft X-rays. Given the name EP240315a, it is an example of a fast X-ray transient (FXRT).

Because the WXT can pinpoint transients so quickly, other telescopes could make follow-up observations in real time. Within an hour after its first detection, the Asteroid Terrestrial-Impact Last Alert System (ATLAS) captured the event in visible light. Other observations from the Gemini-North telescope in Hawaii and the Very Large Telescope in Chile were able to measure the redshift of the event. They found that the light of EP240315a traveled for 12.5 billion years to reach us. Radio light from the event was captured from the Australian Telescope Compact Array (ATCA). A global team of observatories allowed astronomers to discover something interesting.

To begin with, radio observations of EP240315a were consistent with a gamma-ray burst (GRB). We often see a burst of X-rays before a GRB, but the X-rays usually appear just a few dozen seconds before the gamma rays. But in this case, the X-rays appeared six minutes before the GRB. This suggests that these GRBs occur through a process we don’t understand. The only way to be sure is to gather more data, which is where the Einstein Probe will come in.

One of the reasons we haven’t seen these kinds of early soft X-rays before a GRB is that they are rather faint. The X-ray light dims and fades as it travels billions of light-years, so it takes a sensitive detector such as the Einstein Probe to see them well. Given the rate at which gamma-ray bursts occur and the wide-field observations of the WXT, we should be able to see many more of them in the near future. Combined with the global team of other observatories, our understanding of GRBs may be set to change in the near future.

Reference: Ricci, Roberto, et al. “Long-term Radio Monitoring of the Fast X-Ray Transient EP 240315a: Evidence for a Relativistic Jet.” The Astrophysical Journal Letters 979.2 (2025): L28.

The post A New Space Telescope is Giving Us New Insights Into Gamma Ray Bursts appeared first on Universe Today.

Here is day 2 of our 3-day conference on Censorship in the Sciences at the University of Southern California, with all talks contained in the 6½-hour video. I will recommend one, and since I missed the bit beginning at 3:30, will give the recommendation of a friend who watched the whole day. I’ve given the whole schedule below.

The first talk you might watch is the first one of the day, a zoom talk by Stavroula Kousta, the Chief Editor of the Springer journal Nature Human Behavior. It begins at 0:00 and ends at 23:49, with the Q&A ending at 34:24.

The journal and its editor became infamous in August of 2022 when it published a paper called “Science must respect the dignity and rights of all humans” (see my post here), which notes this:

This new article in Nature Human Behavior Is well-intentioned, aiming to purge bigotry from science, but goes way over the top in three ways. First, it claims that science is complicit in structural racism at present.  That’s not true, though in the past some scientists and institutions were guilty of this. Second, it assumes that papers submitted to the journal are going to be rife with racism, bigotry, misogyny, and anti-LGBTQ+ bias that will cause “harm”, and therefore authors must be warned in a long document about their biases and how to avoid expressing them. The piece thus gives a long set of rules that actually conform to woke practice. Third, it explicitly states that even papers with publishable scientific results can be rejected if the facts presented are deemed liable to cause harm. And “harm” is often in the gut of the beholder. The article is thus a threat that unless articles conform to a specific ideological stance, they can be rejected even if the data themselves are worth publishing.

As you’ll hear, Kousta somewhat hedges her original claim that papers should not be published if they cause “harm” to readers, including psychological harm.  She notes that the journal’s guidance isn’t about suppressing clear results of research but the conclusions drawn by research. “Harm” could be conclusions—I note that there is often no clear distinction between results and conclusions—that hurt any groups whose rights are protected by international treaties.  She doesn’t discuss the hard cases, for example research reporting any differences in IQ or educational attainment between ethnic groups. She also suggests that the “harms” of research could be minimized by the journal by giving “accompanying commentary” or an “accompanying editorial.” Those, however, an implicit view by the journal that the paper cannot stand on its own. Her talk sounds like an attempt to rebut the criticisms of the paper that arose immediately.

The first question (23:53) was by journalist Jesse Singal about one example of a potentially harmful result, emphasizing the slippery-ness of the concept of “harm”.  Julia Schaletzky, on my own panel, asks the third question, and it’s a good one, dealing with “harms” whose prevention could lead to longer-term harms to the community. (Somebody should have asked Kousta to give a concrete example of a piece of research that should be deep-sixed from the journal because it harmed a group of people.)  Kousta implies that this could never happen, but it in fact a manuscript from a federally funded study, showing that giving children puberty blockers does not increase their overall psychological well-being, has been withheld (by the author, Johanna Olson-Kennedy, not by the journal) certainly because those results don’t jibe with what gender ideologists want to see.

Pinker’s tweet:

My objection to this kind of vetting of articles when the concept of “harm” is so badly slippery these days was echoed in a tweet by Steve Pinker:

Journalists & psychologists take note: Nature Human Behavior is no longer a peer-reviewed scientific journal but an enforcer of a political creed. I won’t referee, publish, or cite (how do we know articles have been vetted for truth rather than political correctness)? https://t.co/3qXFGizt6h pic.twitter.com/G5BgB2hpqD

— Steven Pinker (@sapinker) August 26, 2022

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Luana recommends Cory Clark‘s talk, “From worriers to warriors: The rise of women in science and society,” which begins at 5:13:40 and ends at 5:37:01, followed by Q&A that ends at 5:48:20. Her hypothesis, which is hers, is that many of the ideological problems that plague science now, as well as some salubrious effects, are actually the result of the success of women, whose evolutionary past bequeathed them a set of behaviors different from those those of men.  Clark’s contention: women evolved to hold grudges longer than men, are more empathic than men, more egalitarian, and so on. She goes on to show surveys of sex differences bearing on cancelation and wokeness.

These differences, she says, lead to an increased emphasis on equity and on avoidance of harm, as well as to an increase in ostracism, producing not only wokeness in academia but also a cancel culture relying more heavily on female than on male beliefs. There are salubrious effects as well, such as the female emphasis on reduced animal testing and “the fall of competent but criminal men.” Women, she says, are more likely to be “social warriors.” It’s really an encouragement to take an evolutionary-psychology look at how sex differences in behavior have influenced academia. In the Q&A, Clark notes how she’s been ostracized, and one questioner says she would like to push Clark down an elevator shaft and that nursing, a woman-dominated profession, does not suffer from the problems that, Clark says, affect academia. Another questioner agrees with Clark’s patterns, but attributes them to acculturation rather than evolution.

Guest Rogue Andrea Jones Roy; News Items: Unexpected Scientific Results, Trust In Scientists, Red Dye #3, Andromeda Mosaic, Telepathy Tapes; Who's That Noisy; Science or Fiction

Even with all we’ve learned about Mars in recent decades, the planet is still mysterious. Most of the mystery revolves around life and whether the planet ever supported any. But the planet teases us with more foundational mysteries, too.

One of those mysteries is the Martian dichotomy: Why are the planet’s northern and southern hemispheres so different?

For some reason, Mars’ southern hemisphere is predominantly highlands and has a higher elevation than the northern hemisphere—about 5km (3 mi) higher. The south also has a thicker crust, is older and is covered in craters.

The northern hemisphere is a vast, smooth plain with a thinner crust and fewer craters. It is also less magnetized than the south.

Elevation map of Mars, based on data obtained by the Mars Global Surveyor’s MOLA instrument. The northern hemisphere is a smooth plain with a lower elevation than the southern hemisphere. Image Credit: NASA/GSFC

Scientists have been puzzling over this dichotomy and have proposed different reasons for it. One leading theory involves a massive impact. Some researchers using geophysical modelling have suggested that a Pluto-sized body struck Mars early in its history. The impact could’ve created the northern lowlands as a gigantic impact basin.

Other researchers have proposed that the planet’s internal (endogenic) processes created the dichotomy. Plate tectonics or mantle convection could’ve been behind it.

Either way, the dichotomy is fundamental to understanding Mars. We can’t understand the planet’s evolution without revealing the mystery behind the dichotomy. This is why NASA and the DLR launched the InSight lander, which reached the Martian surface in November 2018.

The lander’s name stands for Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport. Among its instruments was SEIS, the Seismic Experiment for Interior Structure. SEIS helped scientists better understand Marsquakes by detecting and measuring hundreds of them. It also helped them measure crustal thickness and investigate the mantle. InSight’s data also helped them constrain the size of Mars’ core.

Scientists are still working with InSight’s data, and a new research letter published in the AGU’s Geophysical Research Letters suggests that Mars’ convection is behind the Martian dichotomy. It’s titled “Constraints on the Origin of the Martian Dichotomy From Southern Highlands Marsquakes.” The authors are Weijia Sun from the Chinese Academy of Sciences and Professor and geophysicist Hrvoje Tkalcic from the Australian National University.

The authors state the Martian dichotomy in clear terms: “The Martian hemispheric dichotomy is delineated by significant differences in elevation and crustal thickness between the Northern Lowlands and Southern Highlands.” The altitude difference is about equal to the height of the tallest mountains on Earth.

This research is based on a cluster of Marsquakes in the Terra Cimmeria region of the southern highlands. “We analysed waveform data from so-called low frequency marsquakes captured by NASA’s InSight seismograph on Mars,” Professor Tkalcic said. “In doing this, we located a cluster of six previously detected, but unlocated marsquakes in the planet’s southern highlands, in the Terra Cimmeria region.”

These quakes gave the researchers new seismic data from previously unstudied regions, which is significant because it allows them to compare the data to seismic data from other regions, especially from the Cerberus Fossae region in the northern lowlands.

A MOLA map showing the boundaries of Terra Cimmeria and other nearby regions. Image Credit: By Jim Secosky modified NASA image. Public Domain.

Cerberus Fossae is a series of near-parallel fissures on Mars. Scientists think they were created by the Tharsis volcanoes to the east and Elysium to the west.

The image on the left is a vertical plan view of Cerberus Fossae. The pair of trenches are very young and formed from volcanic activity only a few million years ago. Image Credit: ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO. The image on the right shows Cerberus Fossae in context. Image Credit: NASA MGS MOLA Science Team.

The researchers worked with InSight’s seismic data and improved the signal-to-noise ratio. That improvement allowed them to pinpoint the locations of the marsquakes. “Here, we improve the signal-to-noise ratios and determine the locations of the low-frequency marsquakes recorded during the InSight mission. We find a new cluster of marsquakes in Terra Cimmeria, Southern Highlands, in addition to those previously located in Cerberus Fossae, Northern Lowlands,” they write.

The researchers used what’s called the spectral ratio method to determine the quality of the waves. In this context, quality refers to how quickly seismic waves lose energy as they travel through the Martian interior. It’s expressed as a value for ‘Q’ which was different between the Cerberus Fossae region and the Terra Cimmeria region.

This figure from the research letter illustrates some of the work. (a) shows the topography with location names marked. (b) shows Marsquake locations from InSight Marsquake Service (2023) in blue stars, and this study’s locations are in red stars. (c)–(e) are enlarged views of Marsquake locations for clarity, with (c) showing the new cluster of quakes. The yellow triangle shows InSight’s location. Image Credit: Sun and Tkalcic 2025.

“Using the spectral ratio method, we estimate the quality factor Q in the range 481–543 for Terra Cimmeria versus 800–2,000 determined for Cerberus Fossae,” the researchers explain. A higher Q in the Southern Highlands’ Terra Cimmeria indicates that seismic waves there ‘attenuate’ or lose energy more quickly.

Such a large difference in Q between regions indicates that the subsurfaces are substantially different from one another. Temperature and mantle convection could be the key. “The attenuation difference might be linked to the temperature differences between the two hemispheres, along with more vigorous convection beneath the Southern Highlands,” the paper states.

“The data from these marsquakes, when compared with the well-documented northern hemisphere marsquakes, reveal how the planet’s southern hemisphere is significantly hotter compared to its northern hemisphere,” Professor Tkalcic said. “Understanding whether convection is taking place offers clues into how Mars has evolved into its current state over billions of years.”

Researchers’ primary goal in studying the Martian dichotomy has been to determine whether endogenic or exogenic processes or events are responsible. However, the impact theory is hampered by timing. There are significant geochronological constraints for giant impacts on Mars. Crater data, mineral distribution, and the presence of river channels all conflict with the impact hypothesis, which most researchers suggest had to have happened early in the Solar System’s history.

“These seismological observations, together with geochronological constraints of giant impacts, reinforce the “endogenic” hypothesis that mantle convection causes the crustal dichotomy,” they explain.

This figure from the research letter illustrates some of the results. It shows the endogenic origin of the Martian dichotomy from seismological observations. “Although other mechanisms may contribute to attenuation (dislocations, melt, pre-melting effects), we infer that the observed attenuation difference stems mainly from the temperature difference,” the authors write. “Our interpretation <in Figure 4> is compatible with the finding that the mantle temperature is substantially higher beneath the Southern Highlands than in the Northern Lowlands.” Image Credit: Sun and Tkalcic 2025.

Are these findings a breakthrough in understanding the Martian dichotomy? Possibly. Compared to our seismic probings of Earth’s interior, Mars is practically undiscovered.

“On Earth, we have thousands of seismic stations scattered around the planet. But on Mars, we have a single station, so the challenge is determining the location of these marsquakes when you have only a single instrument,” Professor Tkalcic said.

It seems that the researchers have met that challenge.

“These findings, supported by geochemical analysis of Martian meteorites, provide valuable in situ seismological observations that support the “endogenic” hypothesis, suggesting that mantle convection plays a crucial role in forming the Martian crustal dichotomy,” the authors explain.

The post A Marsquake Reveals Why Mars has Two Very Different Hemispheres appeared first on Universe Today.

As California expands its prescribed burning efforts, a study of more than 180 such projects suggests they are an effective way to reduce a blaze's intensity and smoke

The Vera C. Rubin Observatory, previously known as the Large Synoptic Survey Telescope (LSST), will be the first observatory of its kind. Jointly funded by the National Science Foundation (NSF) and the Department of Energy (DOE), Rubin will conduct the Legacy Survey of Space and Time (LSST) – a 10-year survey of the southern hemisphere. The observatory is expected to collect 15 terabytes of data a night, which will be used to create an ultra-wide, ultra-high-definition, time-lapse record of the cosmos, containing tens of billions of stars, galaxies, and astronomical objects.

After ten years of construction, the Vera C. Rubin Observatory is less than one year away from starting this revolutionary observation campaign. In preparation for this, the observatory recently completed a series of full-system tests using an engineering test camera. With this milestone complete, the stage is now set for the installation of the 3200-megapixel LSST Camera (LSSTCam), the world’s largest digital camera. Once mounted on the Simonyi Survey Telescope, the observatory will have finished construction and be ready to collect its first light.

The engineering test camera, the Commissioning Camera (ComCam), is a much smaller version of the LSSTCam. It relies on a mosaic of nine 3.2-megapixel Charge-Coupled Device (CCD) sensors, providing a total area coverage of 144 megapixels – about twice the size of a full Moon. During the ComCam engineering test campaign, which took place from October 24th to December 11th, 2024, the camera acquired approximately 16,000 exposures to test the Rubin Observatory’s hardware, software, and data pipeline.

A single test engineering image from the very first night of the ComCam campaign in the context of the coverage provided by the LSSTCam. Credit: RubinObs/NOIRLab/SLAC/NSF/DOE/AURA.

The tests were conducted by Rubin’s international commissioning team, composed of hundreds of engineers, scientists, and observing specialists. According to a statement issued by the Rubin Observatory, the test included verifying that the telescope’s complex systems were all working together, testing the early image quality in all six of the system’s filters, and running the data processing pipelines. They also verified that the system can transmit large amounts of data from the observatory to the Department of Energy’s SLAC National Accelerator Laboratory.

They also confirmed the Active Optics System (AOS), which maintains the precise positions and shapes of the telescope’s three large mirrors. The Simonyi Survey Telescope, the camera, data systems, networks, and everyone involved in the engineering test were said to have performed exceptionally well. The test delivered high-quality images within the first hours, even though most of the detailed optical adjustments and environmental controls were not fully activated. Per the statement:

“Thanks to the dedicated efforts and talents of thousands of people over many years, the telescope had been assembled with all its complex parts positioned correctly to better than about one millimeter. Equally satisfyingly, the high-speed network connecting Chile and the data center at SLAC, the data systems, and the algorithms for analyzing the data worked well, too.”

The LSSTCam has 189 CCD sensors, giving it a field of view roughly 45 times the size of a full Moon – over 21 times that of the ComCam. For the final phase of construction, the LSSTCam will replace the ComCam on the Simonyi Survey Telescope. When coupled with this 8.4-meter (27.5-ft) telescope, the LSTTCam will capture images of very faint and variable objects at an unprecedented rate. The installation will take a few months, followed by the observatory capturing its “First Look” images of the cosmos.

The complete focal plane of the future LSST Camera shows the 189 individual sensors that will produce 3,200-megapixel images. Credit: Jacqueline Orrell/SLAC National Accelerator Laboratory

“The success of the engineering test phase has given a surge of excitement and anticipation to the team,” said Deputy Director for Rubin Construction Sandrine Thomas. “Reaching this milestone has offered a small taste of what is to come once Rubin Observatory begins its 10-year survey.” Once the final testing and verification phase is complete, the Rubin Observatory will begin the most comprehensive data-gathering mission ever performed in the history of astrophysics.

The observatory is named in honor of American astronomer Dr. Vera C. Rubin, whose work was foundational to the theory of Dark Matter. By repeatedly scanning the southern sky with its cutting-edge instruments for a decade, Rubin will create an ultra-high-definition time-lapse record of the cosmos. This data will allow scientists to investigate Dark Matter, Dark Energy, and other mysteries facing astronomers, astrophysicists, and cosmologists today.

Further Reading: Rubin Observatory

The post Vera Rubin Completes its Comprehensive System Tests appeared first on Universe Today.

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