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

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

In the depth of winter, a sweeping view of our solar system will glow in the night sky. In total, six planets will be visible ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

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

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

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

During just one night in late February, they will be joined by Mercury, a rare seven-planet alignment visible in the sky. But ...

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

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

Astronomers have discovered extremely powerful winds pummeling the equator of WASP-127b, a giant exoplanet. Reaching speeds ...

Starting up again Saturday, a sweeping view of our solar system will glow in the night sky. The planetary alignment, or a ...