Comets are made of ice, dust, and rocky material.
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The observable universe is about 93 billion light‑years wide.
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Asteroids vary widely in size and composition.
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The Moon completes an orbit around Earth in about 27 days.
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Black holes can slow time so much that seconds near them equal years far away.
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The Moon has no liquid water on its surface today.
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Black holes can slow time so much that seconds near them equal years far away.
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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 International Space Station orbits Earth every 90 minutes.
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