UN IVERS E The universe is everything that exists , including all matter , energy , time and space . The universe is believed to have started with the Big Bang , a huge explosion that occurred about 13 billion years ago . G AL AX Y A galaxy is a collection of stars , dust and gas held together by gravity . There are billions of galaxies in the universe . The Milky Way is one of them . S OL AR SYSTEM The solar system consists of the sun and the planets orbiting around it . There are eight planets in the solar system : Mercury , Venus , Earth , Mars , Jupiter , Saturn , Uran us and Neptune . PL AN ET A planet is a large , round object that orbits around a star . There are eight planets in the solar system : Mercury , Venus , Earth , Mars , Jupiter , Saturn , Uran us and Neptune . STAR A star is a huge , bright object that is made of hot , g
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