Mercury -
In 1974 scientists sent the Mariner 10 probe to visit Mercury.
Mercury has almost no atmosphere.
Venus -
Venus is about the same size as Earth.
Venus days are 243 Earth days.
Earth -
Earth is the only planet with an atmosphere.
The Earth has only one moon.
Jupiter -
Jupiter is a gas giant.
Jupiter's atmosphere is mainly hydrogen and helium.
Saturn -
The Voyager space probe explored Saturn's rings.
The rings are probably made of ice, dust and chunks of rock.
Uranus -
Uranus has a ring around its center.
Uranus is the farthest planet you can see without a telescope.
Neptune -
Neptune could hold 60 Earths if it was hollow.
Neptune takes more than 100 Earth years to orbit the sun.
Mars - The Aliens Home Planet
Mars nickname is the Red planet.
Mars has 2 moons.
