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

YR4 might force NASA to plan the first-ever space mission to push an asteroid away from Earth. Most likely, though, it's a ...

The building blocks of life could have been delivered to Ceres by one or more space rocks from the outer asteroid belt.

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

Astronomers have found two planets around two separate stars that are succumbing to their stars' intense heat.

Astronomers have found two planets around two separate stars that are succumbing to their stars’ intense heat. Both are ...

Kepler was one of the most successful exoplanet-hunting missions so far. It discovered 2,600 confirmed exoplanets—almost half ...

If it’s real, some may question whether something with a mass about three times Pluto’s counts as a planet at all.

The simulation was ‘meticulously engineered’ to find the toughest animalArtificial intelligence has crowned the toughest animal on planet Earth ...

Two papers showed these intriguing signals, but the team stresses that there are currently many uncertainties to confirming ...

Deeply hidden in Earth's mantle there are two huge 'islands' with the size of a continent. New research shows that these regions are not only hotter than the surrounding graveyard of cold sunken ...

An object we thought belonged to the most common category of planet in the galaxy has turned ... So-called mini-Neptunes can be of a similar size, but their composition is significantly different, ...