The Milky Way's black hole, Sagittarius A*, flares in X-rays several times daily.
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Neutron stars can collide and produce heavy elements.
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Mercury has no substantial atmosphere to trap heat.
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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 Milky Way galaxy is part of the Local Group.
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The Earth's gravity keeps the Moon in orbit.
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