The four planet-strong "planet parade" currently visible to the naked eye in the night sky for a short time after sunset will ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

To get somewhere in outer space, you can’t exactly drive in a straight line. Orbits are tricky things, and sending a probe to ...

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

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

One lucky East Lancashire stargazer caught a glimpse of the rare celestial phenomenon - the planetary alignment.

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Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

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

Scientists have been unable to determine whether the dwarf planet’s organics were produced by its own chemical processes or ...

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.