The event horizon marks the boundary around a black hole.
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The Moon completes an orbit around Earth in about 27 days.
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The Earth is not perfectly round.
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There are rogue planets drifting through space with no star at all.
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The Voyager probes have traveled beyond the heliosphere.
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The observable universe is about 93 billion light‑years wide.
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The observable universe is about 93 billion light‑years wide.
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The Wow! signal was a strong radio signal detected in 1977 that has never been fully explained.
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Black holes can slow time so much that seconds near them equal years far away.
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