Some birds can navigate using the position of the stars.
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The Earth's oceans cover more than 70% of the planet's surface.
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Project Mercury was the first U.S. human spaceflight program.
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The observable universe is about 93 billion light‑years wide.
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The universe is estimated to be about 13.8 billion years old.
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Black holes can slow time so much that seconds near them equal years far away.
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The observable universe is about 93 billion light‑years wide.
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Light from distant galaxies shows us the past.
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Venus rotates in the opposite direction of most planets in our solar system.
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