If everything in our solar system formed from the same solar nebula, why do the planets have different compositions? Herbert WichTitusville, Florida To better understand why the planets have variable ...

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

Two exciting new studies detail the life-supporting contents of a 4.3-ounce sample of the asteroid Bennu. The OSIRIS-REx ...

Our solar system consists of the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, as well as countless asteroids and comets, that are gravitationally bound to the Sun.

But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might still be nine if some astronomers are correct about an as-yet ...

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

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

Because planets always appear in a line, the alignment isn't anything out of the norm. What's less common is seeing so many ...

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in ...

Worlds will align for a "planetary parade" in January, with four bright and easily visible to the naked eye. But an even ...

Further simulations on flybys into the inner Solar System revealed one of our own planets might be flung out of the ballpark ...