A sea star moves using tiny tube feet.
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The Hubble Space Telescope has captured deep images of distant galaxies.
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The Voyager probes have traveled beyond the heliosphere.
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Exoplanets have been discovered in habitable zones around distant stars.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Dark energy is thought to drive the accelerating expansion of the universe.
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The event horizon marks the boundary around a black hole.
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The Moon's surface is covered in craters.
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The light you see from some stars today began traveling before humans existed.
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