The TRAPPIST-1 system contains seven Earth-sized planets, three of which are in the habitable zone.
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The Earth's axis is tilted about 23.5 degrees.
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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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Some galaxies appear distorted due to gravitational effects.
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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 light you see from some stars today began traveling before humans existed.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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