According to a study by the National Science Foundation, only half of Americans believe in evolution, and one in 4 don't know that the Earth orbits the Sun.
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The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
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An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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It would take more than 150 years to drive a car to the sun.
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If NASA sent birds into space they would soon die; they need gravity to swallow.
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A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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