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

"This planet could play a pivotal role in future missions... to search for biosignatures indicating potential life, " Dr.

Stargazers will be treated to a dazzling six-planet "alignment" this January.

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Mars is in opposition through the entire month of January, meaning it will be directly opposite the Sun from Earth and will ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

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

UK researchers have confirmed the existence of a “super Earth” located 20 light-years away that could reveal the existence of ...

An exoplanet is a planet outside our solar system that usually orbits a star in our galaxy. More than 7,000 have been found ...

Although it's being mistakenly promoted as a "rare planetary alignment," one of the best "planet parades" in half a century ...