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

Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

Both systems include a moon that is a large fraction of the size of the main body, unlike other moons in the solar system ... while the moons of the giant planets make up a small fraction of ...

15, 2025 — New observational data and simulation models have confirmed a new type of planet ... the Earth-Moon system. Both systems include a moon that is a large fraction of the size ...

Researchers accounted for the previously overlooked structures of the dwarf planet and moon in computer simulations of a ...

From January to March, the night sky will host a spectacular parade of planets featuring Venus, Mars, Jupiter, Saturn, Uranus ...

Aside from Earth, no planet in the solar system captures our imagination quite like Mars. The Red Planet is one of the few ...

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets, a new study suggests.

An asteroid that orbited near Earth for a few months as a mini-moon may be a chunk of the moon that was blasted off by an ...

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But ...

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