Science

Back in 2014, the Atacama Large Millimeter/submillimeter Array (ALMA) captured an image of a young protoplanetary disk around a young star named HL Tauri. The image showed gaps and rings in the disk, substructures indicating that young planets forming there. This meant that planet formation began around young stars a lot sooner than thought. ALMA is continuing its investigation of protoplanetary disks in its ARKS survey (ALMA survey to Resolve exoKuiper belt Substructures).

New experiments reveal that protein precursors can form naturally in deep space under extreme cold and radiation. Scientists found that simple amino acids bond into peptides on interstellar dust, long before stars and planets exist. This challenges the idea that complex life chemistry only happens on planets. It also boosts the odds that life-friendly ingredients are widespread across the universe.

Well, this is the last batch of photos I have, so you know what to do.

Today’s contribution is from Ephraim Heller, this time with photos from America rather than Brazil. Ephraim’s captions and IDs are indented, and you can enlarge the photos by clicking on them.

It has been a busy January on the Snake River in Grand Teton National Park.

After a warm early winter, a few weeks ago we finally had a hard freeze. A branch of the Snake River froze solid. However, there is a location where a warm spring feeds into the branch and this inlet stayed open. Hundreds of Utah sucker fish (Catostomus ardens) were trapped in this area of open water surrounded by ice, isolated from the main body of the Snake River. Naturally, this provided a smorgasbord for the local bald eagles and coyotes.

As I observed the Utah suckers at various times of day, I noticed that in the late afternoon they would all rise to the surface and expose their dorsal fins. Intrigued, I queried my AI which informed me that this is a matter of oxygen dynamics:

• The warm water holds less oxygen than cold water, and thermal springs typically have low dissolved oxygen content due to high temperatures.
• In confined areas with high fish density, oxygen is rapidly depleted.
• Fish respond to low oxygen levels by “piping” or “aquatic surface respiration” (ASR) when oxygen levels drop below critical thresholds. This behavior involves positioning at the water surface with mouths/dorsal fins exposed to access the oxygen-rich surface layer. This behavior indicates that the fish are stressed.

However, the AI also stated that “Aquatic plants produce oxygen through photosynthesis during daylight, with peak production in late afternoon. At night, plants consume oxygen through respiration. Dissolved oxygen levels are highest in late afternoon and lowest just before dawn.” This doesn’t seem consistent with the timing I observed.

I don’t know how much of this is true vs. AI hallucination, but it sounds plausible to me. I’d appreciate it if the ichthyologists and limnologists among the readers would confirm or refute this story.

Now for the photos:

Here are the Utah sucker fish at the surface of the open water pool in the evening, trapped by the surrounding ice:

Here is a close up of the fish at the surface:

Every so often the fish would go into a frenzy at the surface. I don’t know why. It was unrelated to anything I saw happening at the surface. Here is a bald eagle (Haliaeetus leucocephalus) watching the frenzy and assessing his menu options:

Having made up his mind, the eagle helps himself to a serving of fresh fish:

The common ravens (Corvus corax) have found a lovely rotting fish. Instead of exerting the effort to catch a fresh fish, this eagle has decided that it is easier to steal the carrion:

Bald eagles are kleptoparasites, so when an eagle with energy and initiative catches a fish the other eagles won’t let him dine in peace:

Ravens are smart birds. This one is surely thinking “If those eagle ignoramuses can catch a fish then surely I can do it better.” Unfortunately for him, the fish got away:

In spite of their inability to fish, common ravens are handsome birds:

To my surprise, the North American river otters (Lontra canadensis) who live half a mile downstream have not been dining at the buffet. I think it is because this branch of the river is frozen solid and the otters don’t like traveling on the ice surface for long distances without the safety of accessible water. So I donned my cross country skis and visited them at another, unfrozen branch of the Snake River. They, too, were feasting on Utah suckers:

Also on the river are trumpeter swans (Cygnus buccinator) in the morning mist:

Trumpeters need a long runway to take off. These four are just starting to accelerate:

Once airborne they are graceful:

Finally, this old-time general store sits adjacent to the Snake River in Grand Teton National Park. In this star trail time lapse, the stars are, of course, circling Polaris, the north star. The Tetons are to the left of the store:

Recently the World Health Organization published their guidelines on traditional medicine, actually referring to the category of “traditional, complementary and integrative medicine (TCIM) practices.” As has long been the case, there are some good parts to their approach, but also some concerning aspects, and at times it feels self-contradictory. The problems begin with their definition. I dislike lumping traditional, complementary, and integrative […]

The post WHO On Traditional Medicine first appeared on Science-Based Medicine.

This follow-up to the influential 28 Days Later continues to take the zombie movie franchise in a surprising and thought-provoking direction

Material science plays an absolutely critical role in space exploration. So when a new type of self-healing composite is announced, it’s worth a look–especially when the press release specifically calls out its ability to repair microtears associated with micrometeoroid impacts on satellites. It sounds like just such a composite material was recently invented at North Carolina State University - and it’s even already been spun out into a start-up company.

A popular idea suggests a link between big brains and a rich social life, but octopuses don't fit the pattern, which suggests something else is going on

A new building material developed by engineers at Worcester Polytechnic Institute could change how the world builds. Made using an enzyme that turns carbon dioxide into solid minerals, the material cures in hours and locks away carbon instead of releasing it. It’s strong, repairable, recyclable, and far cleaner than concrete. If adopted widely, it could slash emissions across the construction industry.

Solar Orbiter has captured the clearest evidence yet that a solar flare grows through a cascading “magnetic avalanche.” Small, weak magnetic disturbances rapidly multiplied, triggering stronger and stronger explosions that accelerated particles to extreme speeds. The process produced streams of glowing plasma blobs that rained through the Sun’s atmosphere long after the flare itself.

Scientists have discovered that the human brain understands spoken language in a way that closely resembles how advanced AI language models work. By tracking brain activity as people listened to a long podcast, researchers found that meaning unfolds step by step—much like the layered processing inside systems such as GPT-style models.

How can scientists estimate the pH level of Enceladus’ subsurface ocean without landing on its surface? This is what a recently submitted study hopes to address as a team of scientists from Japan investigated new methods for sampling the plumes of Enceladus and provide more accurate measurements of its pH levels. This study has the potential to help scientists better understand the subsurface ocean conditions on Enceladus and whether it’s suitable for life as we know it.

Humpback whales off the west coast of Canada have learned a cooperative hunting technique from whales migrating into the area, and this cultural knowledge may help the population cope as food becomes scarce

People who combine different types of exercise - such as running, cycling and swimming - seem to live longer than those with less varied workouts

Newly developing stars shrouded in thick dust get their first baby pictures in these images from NASA’s Hubble Space Telescope. Hubble took these infant star snapshots in an effort to learn how massive stars form. Protostars are shrouded in thick dust that blocks light, but Hubble can detect the near-infrared emission that shines through holes carved in the gas by the young stars themselves.

The Ring Nebula is a well-studied planetary nebula about 2,570 light-years away. Nnew observations of the nebula with a new instrument have revealed a previously unseen component. The William Herschel Telescope used its WEAVE instrument to detect a massive 'iron bar' inside the nebula's inner layer.

Startling findings in 2024 suggested that metallic nodules on the sea floor produce oxygen and might support life. Now researchers are planning an expedition to learn more and refute criticism from mining companies

Countries have spent beyond their sustainable water budgets for so long that critical assets are depleted and the world faces huge economic, social and environmental costs

An electrical outage at Chernobyl nuclear power plant risks dangerous fuel overheating, but experts say that the chances are extremely slim due to the age of the reactors, which were shut down over two decades ago

Two or more satellites could communicate and manoeuvre around one another using magnetic fields, although getting the technique to work at scale in space might be tricky

The US’s federally funded space program has been struggling of late. With the recent cancellation of the Mars Sample Return mission, and mass layoffs / resignations taking place at NASA, the general sense of a lack of morale at the agency is palpable, even from a distance. Jared Isaacman, the billionaire software entrepreneur and rocket enthusiast who was recently confirmed as NASA administrator during his second confirmation hearing, hopes to change that, and one of his priorities is pushing the Artemis missions for a permanent human presence on the Moon. However, at least one big technical hurdle remains before being able to do so - how to power a base during the two week long lunar night. A recent press release describes how NASA, and another branch of the federal government (the Department of Energy - DoE) hope to solve that problem - with a lunar-ready nuclear fission reactor