Light from distant galaxies takes billions of years to reach Earth.
Fact #3127
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The Voyager 1 spacecraft is the farthest human-made object from Earth and still communicates with us.
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A day on Mars is slightly longer than a day on Earth.
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The Earth's gravity keeps the Moon in orbit.
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Saturn has dozens of known moons.
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The Moon has no liquid water on its surface today.
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The observable universe is about 93 billion light‑years wide.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Black holes form from collapsed massive stars.
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