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

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

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

The new exoplanet, Enaiposha, also known as GJ 1214 b has never been seen before and is now officially being called a "Super-Venus." ...

Early 2025 is a good time for skygazing and spotting up to seven planets in the night sky – if you have a little help.

Different types of molecules have different ... A planet's mass, taken together with its physical size, tells us the planet's density. Density, in turn, tells us a lot about what a planet must ...

Roughly half the size of our own Jupiter ... Similar gas giant planets can have vastly different atmospheric compositions with disparate cloud or haze properties. Located some 869 light years ...

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.