The Rosetta spacecraft became the first to orbit and land a probe on a comet in 2014.
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The observable universe is about 93 billion light‑years wide.
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Venus is sometimes called Earth's sister planet.
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The observable universe is about 93 billion light‑years wide.
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The surface of Venus is hidden beneath thick clouds.
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The Moon's gravity affects ocean tides.
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The observable universe is about 93 billion light‑years wide.
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Black holes can slow time so much that seconds near them equal years far away.
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Black holes can slow time so much that seconds near them equal years far away.
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