Solar System, Galaxies, Planets

Match it! Select the correct answer from the pull down...Good luck!

Which planet has a very thin atmosphere with extreme daytime and nighttime temperatures?

What is a grouping of stars and planets clumped together in a regular, oval shape called

A grouping of stars and their planets with an undefined shape, have many young stars is called

What is a huge group of stars and their planets bound together by gravity called

The current theory of the solar system in which Earth and the other planets revolve around the sun is called

What is the fourth planet from the sun, has polar icecap and volcanoes?

What has a spherical shape, and must orbit a star called

The distance that light travels in one year, about 6 trillion miles is called