The Milky Way Galaxy is made up of billions of stars, one of which is the __________. (p.9)

The strong force of ___________ created by the sun keeps all the objects in the Solar System in orbit around it. (p.9)

The Sun appears much ____________ from the Earth than other stars because it is much closer to the Earth. (p.9)

The four planets closest to the sun are called the _________ ___________. (p.9)

These planets are small, dense and __________ ___ ________. (p.9)

______________ is the planet closest to the sun. (p.9)

______________ is the second planet closest to the sun. (p.10)

Venus is about the same size as the ____________. (p.10)

______________ is the third planet from the sun. (p.10)

Which planet is about seven times smaller than the Earth? (p.10)