Valentina Tereshkova became the first woman in space in 1963, orbiting Earth 48 times over nearly three days.
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The Moon's surface is covered with regolith, a layer of loose rock and dust.
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The observable universe is about 93 billion light‑years wide.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Time moves slower in stronger gravitational fields.
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