Comets

Comet 67P/Churyumov-Gerasimenko is richer in organic molecules than scientists thought, which could have implications for how life on Earth began.

Donald Edward Machholz was an American amateur astronomer who was the leading visual comet discoverer, credited with the visual discovery of 12 comets that bear his name.

A meteor that erupted in a fireball at the end of July has been traced back to the debris of a comet that formed 4.6 billion years ago.

Mysterious comet K2 made its closest approach to Earth yesterday and is continuing its journey toward the sun.

K2, the most pristine comet ever observed, makes a visit to Earth this week. Here is what scientists have learned about it since its surprising discovery.

As a huge comet makes its closest approach to Earth on July 13, you might be curious why it's so hard to spot.

A megacomet glows in the dark in this long-exposure image captured by an astrophotographer on June 18, before its closest approach to Earth.

As Australia's space program begins to take off, parabolic flights like these will be in high demand.

Occasionally, Earth runs through a particularly narrow, dense clump of debris, resulting in a meteor storm.

Dust particles produced by the largest comet outburst ever detected will be visible even to amateur ground-based telescopes this summer, a study found.