The comet will come much closer to Jupiter in March, zipping within 33 million miles. It will be the mid-2030s before it ...

Over a month after its perihelion, or closest pass of the Sun, observations still clearly show 3I/ATLAS' "anti-tail." ...

The interstellar comet will pass safely by Earth, giving astronomers their best chance to study it up close. Interstellar ...

The Sun is huge, but it's a speck of dust compared to the universe's true giants. This video introduces Stevenson 218, the largest known star, a red supergiant so vast it could swallow our solar ...

The interstellar comet known as 3I/Atlas will pass within 167 million miles of our planet Friday – the closest it gets on its ...

The giant planets weren't always where we find them today. Jupiter, Saturn, Uranus and Neptune formed in a more compact ...

Astronomers monitoring the interstellar object known as 3I/ATLAS say new observations show an unexpected shift in the orientation of its rare "anti-tail" as the object approaches its closest point to ...

Astronomers using NASA’s James Webb Space Telescope have found the strongest evidence yet that a rocky planet outside our ...

While the 21st century has been bumpy, it has also ushered in monumental scientific and technological breakthroughs that have ...

An ultra-hot rocky exoplanet may be wrapped in a dense atmosphere, defying expectations about what small planets can sustain.

Comet 3I/ATLAS will get closest to Earth on Dec. 19, and astronomers will be watching.

In the spirit of the season, the interstellar comet 3I/ATLAS is changing color as it leaves the sun behind — shifting from a ...