The observable universe has a diameter of about 93 billion light-years.
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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 universe is expanding faster.
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Mercury has no substantial atmosphere to trap heat.
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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 Moon is slowly moving away from Earth.
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Some galaxies contain supermassive black holes millions of times the Sun’s mass.
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The Moon's gravity influences ocean tides.
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