A comet born around a distant star is now tearing through our solar system at roughly 150,000 miles per hour, and astronomers have only a few months to study it before it disappears forever.

Spacecraft turn distant worlds from points of light into places with weather, geology, chemistry, and history. Each ...

of 1250 km, making it the largest object discovered in the solar system since the discovery of Pluto in 1930.

Planet Earth is parting company with an asteroid that's been tagging along as a "mini moon" for the past two months. Solar eclipses can have a noticeable impact on the structure and dynamics of ...