Dark energy makes up 68% of the universe and is responsible for its accelerating expansion.
Fact #6557
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The observable universe is about 93 billion light‑years wide.
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Some stars appear to dim irregularly for reasons that are still studied.
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Black holes can slow time so much that seconds near them equal years far away.
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Interstellar objects have passed through our solar system.
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The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
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The Earth's rotation causes the Sun to appear to rise and set.
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The Moon completes an orbit around Earth in about 27 days.
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The International Space Station travels at about 28,000 kilometers per hour.
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