There is a planet made almost entirely of diamond called 55 Cancri e, located about 40 light-years from Earth.
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The Milky Way is estimated to be over 100,000 light-years wide.
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Venus has surface temperatures hot enough to melt lead.
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The Earth's gravity keeps the atmosphere in place.
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There are rogue planets drifting through space with no star at all.
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In 1977, a mysterious signal known as the 'Wow! signal' was detected from space.
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The light you see from some stars today began traveling before humans existed.
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