The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

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

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

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

Claims of a "rare planetary alignment" are misleading; it's just visible planets. A true "golden conjunction" occurs on Sept.

However, not usually on this scale. It refers to more than four planets orbiting around the sun visible on one side of the ...

A suspected planet that appears well-suited to life has had its existence confirmed – and it’s very much in our neighborhood, ...

The study of exoplanets has come a long way since the first detection of a planet orbiting a star other than the Sun in 1995.

A nearby star that may host a planet or two could provide a clue about whether planets orbiting the smallest stars can ...