A Chandra archive search found 84 sources visible almost only below 0.3 keV, exposing a model-dependent reservoir of extreme-ultraviolet radiation in six nearby galaxies.
Nearly five decades after launch, humanity's most distant emissary continues whispering back from the edge of the solar system, defying every expectation of how long a machine can survive in the void.
Rocket Lab has challenged NASA's Mars Telecommunications Network award to Blue Origin, five years after Blue Origin protested NASA's first crewed lunar-lander award to SpaceX.
A NASA-led model identifies cold lunar south-pole shadows where terrestrial fungi and bacteria may remain dormant for days and, in especially protected conditions, longer.
The 2,884-supernova Unite catalogue sharpens a combined-probe hint of evolving dark energy, while its preprint reports only weak Bayesian evidence and no supernova-only detection.
A 69-burst analysis estimates that 76% of ordinary matter lies in diffuse intergalactic gas, with 15% in galactic halos and 9% in stars and cold gas.
Hoba’s 60-tonne iron mass, missing crater and disputed discovery story constrain a rare atmospheric descent that no surviving witness saw.
Halley’s poisonous cyanogen was detectable but harmlessly dilute, while the 1910 tail crossing created a market for pills, leather inhalers and impossible insurance.
Galileo’s final plunge was a planetary-protection decision: NASA used the orbiter’s remaining control to keep an unsterilised spacecraft away from Europa.
A peer-reviewed lensing analysis could reduce GW231123’s inferred total mass from 190–265 to 100–180 solar masses. The signal is a compelling candidate, but gravitational-wave lensing remains unconfirmed.
Orbital evidence links Olympus Mons's aureole to immense flank failures. Water or ice may explain the long runout, but lava-driven melting remains one proposed mechanism.
Astronomers have caught thousands of mysterious cosmic explosions in the act, revealing patterns that hint at what might be triggering them from across the universe.
A glimpse of a celestial wanderer that last visited during the Middle Ages—caught not by professional observatories, but by four amateurs with a telescope and patience.
A stellar nursery the size of a city block holds a monster star waiting to reshape everything around it.
A century of daily photographs reveals how the Sun has transformed—if you're patient enough to notice.
An evolving theoretical warp field developed crossing trajectories under an inertial-motion assumption, exposing the difference between prescribing a bubble and physically stabilising one.
