Pluto is smaller than the United States in surface area.
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The Earth's gravity keeps the atmosphere in place.
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Time moves slower in stronger gravitational fields.
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The Moon was likely formed after a massive collision with early Earth.
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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 Earth's gravity affects the movement of tides.
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Comets can develop long tails when near the Sun.
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In 1961, Yuri Gagarin became the first human in space.
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The observable universe is about 93 billion light‑years wide.
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