Planets are relatively close together

Two things that affect an object's gravity are mass and distance

Gravity of this object keeps planets in their orbits

Planets rotate faster

Planets revolve around the sun faster

Another name for outer planets

Another word for inner planets

Another word for inner planets

All planets have moons

Planet with the shortest day

A day is longer than a year on this planet

Planet with two moons

Two planets with no moons

Planet with thick atmosphere of carbon dioxide

The hottest planet

The hottest planet

Planet with a great red spot caused by a continuous storm

Planet with the most rings

Planet with no atmosphere

The second largest planet

The red planet

This planet rotates on its side.

Who was the first person to go to the moon