A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

Astronomers have found two planets around two separate stars that are succumbing to their stars' intense heat.

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

It was Johann Kepler, almost exactly 400 years ago, who declared that each planet speeds up as it approaches the Sun in its ...