Exoplanets have been discovered in habitable zones around distant stars.
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Venus is sometimes called Earth's sister planet.
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Cosmic rays constantly bombard Earth from space.
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The light you see from some stars today began traveling before humans existed.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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The Yellowstone supervolcano is one of the largest volcanic systems in the world.
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The heliosphere protects the solar system from interstellar radiation.
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There are more stars in the universe than grains of sand on Earth.
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Black holes can slow time so much that seconds near them equal years far away.
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