Project Mercury was the first U.S. human spaceflight program.
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The Earth's atmosphere gradually fades into space.
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The Earth's magnetic field shields the planet from solar wind.
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The observable universe is about 93 billion light‑years wide.
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The observable universe is about 93 billion light‑years wide.
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Venus has the longest day of any planet in the solar system.
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There are rogue planets drifting through space with no star at all.
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There are rogue planets drifting through space with no star at all.
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Neptune is the farthest known major planet from the Sun.
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