There are unknown regions of space.
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The Vostok 1 mission marked the first human spaceflight.
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The Earth's rotation causes day and night cycles.
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The Earth orbits the Sun once every year.
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The Earth completes one full rotation approximately every 24 hours.
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Comets are made of ice, dust, and rocky material.
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Black holes can slow time so much that seconds near them equal years far away.
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Some pulsars emit beams of radiation like cosmic lighthouses.
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Black holes have gravitational pulls so strong that not even light can escape.
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