In a world of wild talk and fake news, help us stand up for the facts.

How far it is from the sun: 886 million miles (1.4 billion kilometers), on average How big it is: 72,400 miles (116,500 km) across, or almost 10 times the size of Earth. How many moons it has: At ...

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with ...

NASA reports more than 400 gas giants – large gas planets like Jupiter or Saturn – have been discovered outside of Earth's solar system. However, the possibility that a gas planet could exist in the ...

Dying stars may be wiping out nearby giant planets as they expand into red giants. Astronomers found that these close-in planets become increasingly rare around more evolved stars, suggesting many ...

We now know of almost 5,000 planets outside the Solar System. If you were to picture what it would be like on one of these distant worlds, or exoplanets, your mental image would probably include a ...