Mercury is the closest to the sun. It's cold at night and very hot at daytime. The second planet is Venus. It is about the same size as Earth. Earth is the third planet from the sun.
Earth is the only planet that can have people on it.
Mars is the fourth planet from the sun. It's called the Red Planet. Jupiter is the fifth planet from the sun. It's the biggest. Saturn is the sixth planet from the sun and is the second biggest.