The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... The Universe contains billions of galaxies, each containing millions or even trillio...
These chunks of rocks and ice are remains of material left behind when the Solar System formed. There are about 1 trillion comets in the Oort Cloud - a vast cloud surrounding the Solar System far beyond the planets.
Halley
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McNaught
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Shoemaker-Levy 9
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