The observable universe spans billions of light-years.
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The Rosetta mission successfully landed a probe on a comet in 2014.
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Neptune is the farthest known major planet from the Sun.
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Saturn's rings are made primarily of ice particles and rocky debris.
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Black holes can slow time so much that seconds near them equal years far away.
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The observable universe is about 93 billion light‑years wide.
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The Earth's magnetic north pole moves over time.
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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 orbits the Sun at about 30 kilometers per second.
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