comets

If Comet Swift-Tuttle smacked into Earth, it would likely be a very bad day for our planet.

Was the 1977 'Wow!' signal communications from an alien civilization? Or was it interference from a passing comet? In 2017, we may finally have an answer.

It's looking less likely that a faraway star's strange dimming can be explained by a swarm of comets or an "alien megastructure."

Sometime in the past 8,000 years, a meteor may have hit the Indian Ocean, triggering a monster tsunami that struck Africa, a new study suggests.

A new study delivers the first evidence that water in ancient dust grains collected at the heart of an infant Earth during its formative years.

From extrasolar planets to extraterrestrial neutrinos, these scientific findings have made sure that 2013 has been an unforgettable year.

After conducting a series of analyses, the researchers determined that a mysterious black pebble discovered years ago in the Egyptian desert is a piece of a comet nucleus — the first ever discovered.