NASA astronaut Don Pettit captured breathtaking video of a rare atmospheric phenomenon from his perch high above Earth on the International Space Station.

Comet SWAN25F was discovered using photos from the European Space Agency's SOHO spacecraft and can currently be spied using backyard equipment — but it could also become visible to the naked eye in the next few weeks.

Video footage captured by NASA's Perseverance rover shows a small "dust devil" merging with a much larger twister on the surface of Mars.

The weapons from a toolkit unearthed in Texas may be the earliest ever found in North America.

The dinosaurs were not in decline before the asteroid hit, a new study finds. Instead, poor fossilization conditions and unexposed late Cretaceous rock layers mean they're either not preserved or hard to find.

Epigenetic changes in the placenta may shape how the fetal brain develops and thus influence the risk of psychiatric disorders.