Could humans survive on other planets? What would it take to live on Mars, Venus, or even a moon like Titan? From low gravity to toxic atmospheres, every planet presents a unique challenge. Watch as ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

NEW YORK (AP) — Six planets grace the sky this month in what’s known as a planetary parade, and most can be seen with the naked eye. These planetary hangouts happen when several planets appear ...

Four planets will be widely visible to the naked eye through part of February, but calling them a 'planetary alignment' may not be the full picture.

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

Planetary hangouts happen when several planets appear to line up in the night sky at once Planetary hangouts happen when several planets appear to line up in the night sky at once Planetary ...