Solar flares can disrupt satellite communications, GPS signals, and power grids on Earth.
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The Earth's rotation is gradually slowing over time.
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The heliosphere protects the solar system from interstellar radiation.
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The observable universe is about 93 billion light‑years wide.
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The light you see from some stars today began traveling before humans existed.
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The Moon always shows the same face to Earth.
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The Vostok 1 mission marked the first human spaceflight.
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Venus has surface temperatures hot enough to melt lead.
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The Fermi Paradox questions why extraterrestrial life has not been observed.
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