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

NASA has been monitoring a never-before-seen planet in its solar system, which is eight times the size of Earth. The ...

Mercury takes only 88 Earth days to orbit the sun.

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

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

While claims of a “rare alignment” are overblown, you can still see up to six planets in the night sky this weekend. Here's ...

While the planets are technically always "aligned" along the same plane in our sky, seeing so many at once is a special ...

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.

The exoplanet has a radius around 2.7 times and a mass about 8.2 times greater than Earth ... and its extreme lack of hydrogen expands our understanding of the diversity of planets (just like this ...

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 ...

HELENA — The planets are aligned. Six planets, Mars, Jupiter, Uranus, Neptune, Venus and Saturn can be seen in the night sky.