The observable universe is about 93 billion light‑years wide.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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There are more trees than stars in our galaxy.
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The Earth's gravity affects the movement of tides.
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Solar flares originate from the Sun's surface.
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The universe is estimated to be about 13.8 billion years old.
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In 1977, a strong narrowband radio signal known as the 'Wow! signal' was detected from space.
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Time moves more slowly in stronger gravitational fields.
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Exoplanets have been discovered in habitable zones around distant stars.
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