The Olympus Mons volcano on Mars is three times taller than Mount Everest and so wide it couldn't be seen from its own base.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
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The light you see from some stars today began traveling before humans existed.
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The Moon has no atmosphere like Earth's.
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Venus is sometimes called Earth's sister planet.
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The Moon's surface is covered with regolith, a layer of loose rock and dust.
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Neptune appears blue because of methane in its atmosphere.
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Saturn could float in water because its density is low.
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