We typically think of the Oort cloud as scattered ice balls floating far from the sun, yet still tied to it gravitationally.

In 19th-century France, the young chemist challenged the theory of spontaneous generation and discovered an invisible world ...

Known as Noctilucent or night-shining clouds, twilight clouds are typically seen on Earth during the summer, but this time, ...

So, if astrobiologists ever do find alien life with a weird chemistry that uses some liquid other than water, it's not likely ...

The person who took the photo is "extremely sure" it wasn't on fire and witnessed it as it was the sun setting! "Looks like ...

And now for something completely different: NASA’s Curiosity rover captured a feather-shaped cloud glowing in the Martian sky shortly after sunset on the Red Planet. It dates back to January ...

Learn why a seismologist wants to go ghost-busting in Summerville, South Carolina, and how earthquake lights could help us ...

If you were out enjoying the snow this morning, you may have seen some big flakes in the Triad.

Arizona's dark skies are a haven for astronomers and photographers. Some communities are fighting to keep them that way.