Astronomers from the Harvard-Smithsonian Center for Astrophysics (CfA) and elsewhere report the discovery of a new brown ...

A recently discovered observatory may be the oldest in the Americas, challenging everything we knew about ancient astronomy.

Mars changed from a blue world with water to a red desert because its atmosphere escaped into space over billions of years.

A mysterious cosmic scar reveals two massive stars that passed near our solar system millions of years ago, energizing nearby ...

NASA's Nancy Grace Roman Space Telescope team has released detailed plans for a major survey that will reveal our home galaxy ...

The discovery of a hidden supermassive black hole inside an ancient galaxy suggests that some of our universe's most extreme objects could be invisible unless observed in infrared wavelengths, James ...

The interstellar comet 3I/ATLAS is making its closest approach to Earth on Dec. 19. Learn about the 'reconnaissance mission' ...

Astronomers are closing in on a result so statistically secure that, in their language, it borders on certainty: a 99.9999999 ...

The James Webb Space Telescope has captured the light of a star that exploded when the universe was still in its cosmic youth ...

Interstellar comet 3I/ATLAS is turning green and getting brighter as it nears Earth. Scientists track the ancient space rock, ...

When winter sets in, and daylight is gone well before dinner, it’s hard not to notice how long the nights stretch on. For me, ...

The discovery marks a significant moment for a theory that was once dismissed as fringe science but is now gaining serious scientific traction. Panspermia is far from a modern invention. The concept ...