Hubble Space Telescope mapped Andromeda, revealing a chaotic history shaped by mergers. A 2.5-billion-pixel mosaic shows 200 ...

Astronomers are sounding alarm bells as the world's most precious sky-observing location faces a risk of being blinded by ...

Astronomers have been battling threats to their clear skies on all fronts lately. One of the most notable battles, which we ...

In the years following the launch of NASA's Hubble Space Telescope, astronomers have tallied over 1 trillion galaxies in the universe. But only one galaxy stands out as the most important nearby ...

Most picture the night sky as an endless sea of twinkling stars. But if your eyes could see the universe in X-rays, you’d ...

Messier 31 is located 2.5 million light-years away from Earth and was a much bigger target in the sky than the galaxies ...

There's just something about being fully engulfed in darkness. And, of course, the tiny pinpricks of light that come along ...

Hubble revealed a universe of galaxies that existed beyond ours — but he couldn't have done it without a little help.

A rare parade of planets will light up the night sky throughout January. Six planets will be in alignment for the rest of the ...

A massive white dwarf and a sun-like "blue lurker" star tell a remarkable story of what was once a triple-star system in the ...

In an astronomical feat, using NASA's James Webb Space Telescope, a team of astronomers observed a distant galaxy, uncovering ...