Mercury takes only 88 Earth days to orbit 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 rare seven-planet alignment in February. This is what scientists hope to learn.

The exoplanet, known as GJ 1214 b, was detected by the Hubble Space Telescope and dubbed a "waterworld" by the science ...

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

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

NASA's James Webb Space Telescope has been used to shed new light on the exoplanet, GJ 1214 b, which is more than eight times ...

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

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.

Jan. 15, 2025 — New observational data and simulation models have confirmed a new type of planet unlike anything found in the Solar System. This provides another piece of the puzzle to ...