comets

These dusty comets, speeding through distance space, are the smallest objects ever detected in another star system.

Could the building blocks for life on Earth have been delivered by meteorites crashing into ponds of water 4 billion years ago?

Ancient volcanic deposits on the moon reveal new evidence about the lunar interior, suggesting it contains substantial amounts of water.

A source of mysterious radio signals could be from a passing comet, but astronomers are skeptical.

Comet 45P/Honda-Mrkos-Pajdusakova, returning to the inner solar system after more than five years, will be visible this week with binoculars or a small telescope.

NASA's Hubble Space Telescope has detected several comets diving toward a young star about 95 light-years from Earth.

Was it a magnificent stroke of luck, or was it inevitable?

"Tabby's Star" has dramatically dimmed and we don't know why.

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