Binary star systems, where two stars orbit each other, are more common in the universe than single stars like our Sun.
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The Earth's magnetic field shields the planet from solar wind.
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Comets can develop long tails when near the Sun.
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The observable universe spans billions of light-years.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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Venus has surface temperatures hot enough to melt lead.
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The Earth's magnetic field helps prevent atmospheric loss.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The observable universe is about 93 billion light‑years wide.
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