For a moon to be a supermoon, it needs to be at least 90% full.
Here's some spooky science from our archives to get you in the Halloween spirit.
There are four different types of solar eclipses.
Why is it so hard for people to visually judge how far away the moon is?
Pluto's crater-less surface indicates the presence of geological processes that have erased the marks left by asteroids and comets.
Europa, Jupiter's moon, has water that may support life. The only problem is it's buried under a thick layer of ice.
Our moon stabilizes Earth's axis and makes for habitable conditions; but, scientists discover, life is still possible without moonlit nights.
The moon landing was in fact staged (on the moon) with special flag engineering.
Astronomers discover wind patterns on Titan that recur over tens of thousands of years.
The man in the moon's face was actively formed by hot lava and other geological forces.