The asteroid belt between Mars and Jupiter contains millions of objects — but the total mass is less than the Moon.
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Project Mercury was the first U.S. human spaceflight program.
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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The solar panel converts sunlight into electricity.
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Neutron stars can collide and produce heavy elements.
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Neutron stars can spin hundreds of times per second.
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Mercury has no substantial atmosphere to trap heat.
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The U.S. government ran Project Stargate to study alleged psychic phenomena.
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Saturn's largest moon is Titan.
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