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

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

Scientists suggest an interstellar visitor may have altered planetary orbits in our Solar System, reshaping trajectories of ...

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An object we thought belonged to the most common category of planet in the galaxy has turned out to be something we've never seen before.

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

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A planet-size object that possibly once visited the solar system may have permanently ...

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

When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...