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

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

A planet that may support alien life has been discovered less than 20 light-years from Earth. The "promising" super-Earth - ...

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but get a telescope and you can spot Neptune and Uranus.

If it’s real, some may question whether something with a mass about three times Pluto’s counts as a planet at all.

Sauk Prairie will get a glimpse of one of the two eclipses that will occur over the next thirty days. The total solar eclipse ...

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

While planets circle the sun in what's called a heliocentric orbit, they rarely fall together in what appears to the human eye as somewhat of a line across the visible horizon. Saturday is one of ...

While claims of a “rare alignment” are overblown, you can still see up to six planets in the night sky this weekend. Here's ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...