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 ...

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 ...

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

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 ...

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

Up to seven planets from our solar system could be on display simultaneously, although spotting two of them might require a bit more effort. Over the next month, Mars, Venus, Jupiter, and Saturn ...