The Milky Way is estimated to contain hundreds of billions of stars.
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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The Vostok 1 mission marked the first human spaceflight.
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The largest volcano is on Mars.
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Comets orbit the Sun in elongated paths.
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There are rogue planets drifting through space with no star at all.
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Mercury has no substantial atmosphere to trap heat.
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Saturn could float in water because its density is low.
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The Moon has no liquid water on its surface today.
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