A quasar can emit more energy than an entire galaxy containing billions of stars.
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The Earth is not perfectly round.
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The largest volcano is on Mars.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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There are more stars in the universe than grains of sand on Earth.
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In 1977, a strong narrowband radio signal known as the 'Wow! signal' was detected from space.
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