Space and time from Science Daily Feed

Physicists have found a clever way to detect the elusive Unruh effect without extreme accelerations. By using atoms that emit light cooperatively between mirrors, acceleration subtly shifts when a powerful light burst appears. That early flash acts like a timestamped signature of the effect. The method could make once-theoretical physics experimentally reachable.

A new theory proposes that the universe’s fundamental forces and particle properties may arise from the geometry of hidden extra dimensions. These dimensions could twist and evolve over time, forming stable structures that generate mass and symmetry breaking on their own. The approach may even explain cosmic expansion and predict a new particle. It hints at a universe built entirely from geometry.

Hot Jupiters were once cosmic oddities, but unraveling how they moved so close to their stars has remained a stubborn mystery. Scientists have long debated whether these giants were violently flung inward or peacefully drifted through their birth disks. A new approach from researchers in Tokyo cracks open this puzzle by using the timescale of orbital circularization as a diagnostic.

Astronomers tracked a decade of dramatic changes in P13, a neutron star undergoing supercritical accretion. Its X-ray luminosity rose and fell by factors of hundreds while its rotation rate accelerated. These synchronized shifts suggest the accretion structure itself evolved over time. The findings offer fresh clues to how ultraluminous X-ray sources reach such extreme power.

Webb’s latest observations reveal a hellish world cloaked in an unexpected atmosphere: TOI-561 b, an ultra-hot rocky planet racing around its star in under 11 hours. Despite being blasted by intense radiation that should strip it bare, the planet appears to host a thick layer of gases above a global magma ocean, making it far less dense than expected.

Scientists have managed to observe solar neutrinos carrying out a rare atomic transformation deep underground, converting carbon-13 into nitrogen-13 inside the SNO+ detector. By tracking two faint flashes of light separated by several minutes, researchers confirmed one of the lowest-energy neutrino interactions ever detected.

TRAPPIST-1e, an Earth-sized world in the system’s habitable zone, is drawing scientific attention as researchers hunt for signs of an atmosphere—and potentially life-supporting conditions. Early James Webb observations hint at methane, but the signals may instead come from the star itself, a small ultracool M dwarf whose atmospheric behavior complicates interpretation.

Uranus and Neptune may not be the icy worlds we’ve long imagined. A new Swiss-led study uses innovative hybrid modeling to reveal that these planets could just as easily be dominated by rock as by water-rich ices. The findings also help explain their bizarre, multi-poled magnetic fields and open the door to a wider range of possible interior structures. But major uncertainties remain, and only future space missions will be able to uncover what truly lies beneath their blue atmospheres.

New research reveals that Earth’s solid inner core is actually in a superionic state, where carbon atoms flow freely through a solid iron lattice. This unusual behavior makes the core soft, matching seismic observations that have puzzled scientists for decades. The mobility of these light elements may also contribute energy to Earth’s magnetic field. The findings reshape models of Earth’s interior and could apply to other rocky planets.

Astronomers using the James Webb Space Telescope have captured dramatic helium streams pouring off the super-puff exoplanet WASP-107b, revealing a world with an enormously inflated, weakly bound atmosphere under intense stellar heat. The detection of helium, water, and various chemical compounds—alongside the surprising absence of methane—paints a picture of a planet that formed far from its star but later migrated inward, where scorching radiation now strips its gases into space.

Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their results match “local” measurements but clash with early-universe estimates, strengthening the mysterious Hubble tension. This mismatch could point to new physics rather than observational error. Researchers now aim to boost precision to solve the puzzle.

A sudden X-ray flare from a supermassive black hole in galaxy NGC 3783 triggered ultra-fast winds racing outward at a fifth the speed of light—an event never witnessed before. Using XMM-Newton and XRISM, astronomers caught the blast unfold in real time, revealing how tangled magnetic fields can rapidly “untwist” and hurl matter into space much like an enormous, cosmic-scale version of the Sun’s coronal mass ejections.

New simulations of Milky Way-like galaxies reveal that the strange split between two chemically distinct groups of stars may arise from several very different evolutionary events. Bursts of star formation, shifts in flowing gas, and even streams of metal-poor material from a galaxy’s outskirts can all create this double pattern. The findings challenge the long-held assumption that a major ancient collision caused the split.

A remarkably clean gravitational-wave detection has confirmed long-standing predictions about black holes, including Hawking’s area theorem and Einstein’s ringdown behavior. The findings also provide the strongest support yet that real black holes follow the Kerr model.

XRISM’s high-precision X-ray data revealed unusually strong signatures of chlorine and potassium inside the Cassiopeia A supernova remnant. These levels are far higher than theoretical models predicted, showing that supernovae can be major sources of these life-critical elements. Researchers believe powerful mixing deep inside massive stars is responsible for the unexpected boost. The findings reshape our understanding of how the building blocks of planets and life were created.

Knotted structures once imagined by Lord Kelvin may actually have shaped the universe’s earliest moments, according to new research showing how two powerful symmetries could have created stable “cosmic knots” after the Big Bang. These exotic objects may have briefly dominated the young cosmos, unraveled through quantum tunneling, and produced heavy right-handed neutrinos whose decays tipped the balance toward matter over antimatter.

Scientists have discovered that moonquakes, not meteoroids, are responsible for shifting terrain near the Apollo 17 landing site. Their analysis points to a still-active fault that has been generating quakes for millions of years. While the danger to short missions is low, long-term lunar bases could face increasing risk. The findings urge future planners to avoid building near scarps and to prioritize new seismic instruments.

SQUIRE aims to detect exotic spin-dependent interactions using quantum sensors deployed in space, where speed and environmental conditions vastly improve sensitivity. Orbiting sensors tap into Earth’s enormous natural polarized spin source and benefit from low-noise periodic signal modulation. A robust prototype with advanced noise suppression and radiation-hardened engineering now meets the requirements for space operation. The long-term goal is a powerful space-ground network capable of exploring dark matter and other beyond-Standard-Model phenomena.

SPHERE’s detailed images of dusty rings around young stars offer a rare glimpse into the hidden machinery of planet formation. These bright arcs and faint clouds reveal where tiny planet-building bodies collide, break apart, and reshape their systems. Some disks contain sharp edges or unusual patterns that hint at massive planets still waiting to be seen, while others resemble early versions of our own asteroid belt or Kuiper belt. Together, the images form one of the most complete views yet of how newborn solar systems evolve and where undiscovered worlds may be hiding.

A network of powerful ground-based telescopes captured rare starspot-crossing events on TOI-3884b, revealing cooler patches on the star’s surface and rapid changes tied to its rotation. By combining multicolor transit observations with months of high-cadence brightness monitoring, researchers nailed down the star’s rotation period with impressive precision. These measurements allowed them to map the system’s geometry—and what they found was surprising: the planet's orbit is wildly tilted relative to the star’s spin.