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

Watch this video to find out more about the Earth, planets in our Solar System and other planets far ... Probes are space crafts with cameras to send images back to Earth. This allows us to ...

All of our solar system ... the planets appear in the sky, they all appear roughly along the ecliptic. It isn't a perfect line of planets, because their orbits are tilted slightly, but it is fairly ...

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

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