Derived from the Greek words peri (around) and helios (sun ... the term "aphelion" refers to the point where the orbiting body is farthest from the sun. Earth will reach its closest point ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Finding a world like Earth elsewhere in the universe might mean looking for the right kind of solar system. A new discovery ...

In recent years, scientists have focused their search on temperate, Earth-like planets orbiting nearby stars ... zone of the closest star to the Sun. This milestone shifted attention to stars ...

The lander is currently orbiting Earth ... burn to insert itself into orbit around the moon, where it will spend 16 days ...

An asteroid that orbited near Earth for a few months as a mini-moon may be a chunk of the moon that was blasted off by an impact thousands of years ago.

A near-Earth object was likely ejected into space after an impact thousands of years ago. Now it could contribute new ...