Project Mercury was the first U.S. human spaceflight program.
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The Sun accounts for more than 99% of the mass of our solar system.
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The Earth's magnetic field helps prevent atmospheric loss.
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There are rogue planets drifting through space with no star at all.
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Black holes can slow time so much that seconds near them equal years far away.
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Venus rotates in the opposite direction of most planets in our solar system.
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Some galaxies contain supermassive black holes millions of times the Sun’s mass.
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The universe has no center.
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Gamma-ray bursts are among the most energetic events observed in the universe.
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