The observable universe spans billions of light-years.
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Time moves slower in stronger gravitational fields.
Fact #1755 · Space
Time moves slower in stronger gravitational fields.
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Black holes can slow time so much that seconds near them equal years far away.
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There are rogue planets drifting through space with no star at all.
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In 1961, Yuri Gagarin became the first human in space.
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Fast radio bursts are powerful millisecond-long radio pulses from distant galaxies.
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A day on Venus is longer than its year.
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The event horizon marks the boundary around a black hole.
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