FAQ

Why is Pluto not a planet?

In 2006, the IAU defined a planet as: orbits the Sun, has sufficient mass to be round, and has cleared its neighborhood. Pluto has not cleared its orbit, so it was reclassified as a dwarf planet.

How many moons does Jupiter have?

As of 2024, Jupiter has 95 confirmed moons. The four largest (Io, Europa, Ganymede, Callisto) are called the Galilean moons.

What is the largest asteroid?

Ceres is the largest object in the asteroid belt at 939 km diameter. It is classified as a dwarf planet.

How hot is Venus?

Venus surface temperature averages 464 degrees Celsius due to a runaway greenhouse effect from its thick CO2 atmosphere.