The heliosphere protects the solar system from interstellar radiation.
Fact #1626
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Some galaxies are trillions of miles wide.
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Venus has surface temperatures hot enough to melt lead.
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The Milky Way is estimated to be over 100,000 light-years wide.
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The observable universe is about 93 billion light‑years wide.
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The Earth's atmosphere gradually fades into space.
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The surface of Venus is hidden beneath thick clouds.
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Neutron stars can collide and produce heavy elements.
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Mercury has no substantial atmosphere to trap heat.
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