Fill in the blank spaces with the correct Information ; The Sun is in the center of Solar System and is composed mainly of the elements ( 0 ) and ( 2 ] . The distance from the Earth to the Sun is also called ( 3 ) . Many people dream about building acolony on Mars , but the atmosphere is primarily made of ( 4 ) . We have discovered the ( 5 ) between Mars and Jupiter , which contains millions of small objects , Jupiter has a total of ( 6 } moons : The four largest moons are easilyvisible with a telescope and ( 7 ) is the closest and most active one , Uranus and Nep tune are the outermost planets and it takes Neptune ( 8 ) years to complete one orbit around the Sun ,