Space is completely silent because sound requires a medium to travel through, and space is a near-perfect vacuum.
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The Earth's atmosphere protects life by filtering harmful radiation.
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Mercury is the closest planet to the Sun.
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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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Black holes can slow time so much that seconds near them equal years far away.
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The light you see from some stars today began traveling before humans existed.
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The Moon has lower gravity than Earth.
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The Sun makes up 99.8% of solar mass.
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The Moon has no liquid water on its surface today.
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