Cosmic rays constantly bombard Earth from space.
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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 Mars Pathfinder mission tested new landing techniques.
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A teaspoon of neutron star material would weigh billions of tons.
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The Milky Way is estimated to be over 100,000 light-years wide.
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In the 1960s, Project Orion explored the possibility of nuclear-powered spacecraft.
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The Milky Way galaxy contains billions of stars.
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Black holes can bend light through gravitational lensing.
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The light you see from some stars today began traveling before humans existed.
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