The Andromeda galaxy is on a collision course with the Milky Way, expected to merge in about 4.5 billion years.
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The observable universe is about 93 billion light‑years wide.
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The universe has no center.
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The Voyager Golden Record was sent into space containing sounds and images from Earth.
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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 Earth's gravity affects the movement of tides.
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The Sun makes up 99.8% of solar mass.
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The Earth's gravity keeps the Moon in orbit.
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The light you see from some stars today began traveling before humans existed.
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