Earth, HD 20794 d, orbiting a nearby sun-like star, offering a promising lead in the search for life beyond our planet.

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 ...

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

A California startup wants to beam extra sunlight to Earth orbiting mirrors, but some are skeptical about whether the physics ...

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

NASA is tracking a truck-sized asteroid which is set to hurtle by Earth today at many times the velocity of a speeding bullet ...

There are over 13,000 satellites orbiting the Earth with more ... if someone told you that there were 13,000 cars driving around on the surface of Earth, would you be worried about it?

Thirty years after the discovery of the first exoplanet, astronomers have detected more than 7,000 of them in our galaxy. But there are still billions more to be discovered. At the same time, ...