The Hubble Deep Field image revealed thousands of galaxies in a patch of sky the size of a grain of sand.
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There are rogue planets drifting through space with no star at all.
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Venus is sometimes called Earth's sister planet.
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Asteroids vary widely in size and composition.
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Comets can develop long tails when near the Sun.
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In 1977, a strong narrowband radio signal known as the 'Wow! signal' was detected from space.
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The observable universe is about 93 billion light‑years wide.
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The Moon always shows the same face to Earth.
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A sea star moves using tiny tube feet.
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