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.

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

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

Astronomers may have discovered a scrawny star bolting through the middle of our galaxy with a planet in tow. If confirmed, ...

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.

Most of the information we have about planets beyond our solar system (exoplanets ... This technique can give clues about the planet's size (by looking at how much starlight is blocked) and ...

However, this year a powerful new telescope is coming online that could prove once and for all that there really is a ninth planet in our Solar System. The same year that Pluto was ignominiously ...

An object we thought belonged to the most common category of planet in the galaxy has turned out to be ... because we have nothing directly analogous to them here in our Solar System. Both ...

The solar system consists of 8 planets, including Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Each planet has its own unique characteristics, such as size, composition ...