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

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 ...

Mercury takes only 88 Earth days to orbit the sun.

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

Long ago, a planetary object eight times the mass of Jupiter may have once visited the solar system and altered […] The post ...

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 ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

From west to east, Saturn, Venus, Neptune, Uranus, Jupiter and Mars will make an arc across Wyoming’s night sky in a parade ...

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.