Venus is sometimes called Earth's sister planet.
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The observable universe is about 93 billion light‑years wide.
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The Moon was formed billions of years ago.
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The Moon always shows the same face to Earth.
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Exoplanets have been discovered in habitable zones around distant stars.
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The James Webb Space Telescope observes distant galaxies in infrared light.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Neutron stars can collide and produce heavy elements.
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There are rogue planets drifting through space with no star at all.
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