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 international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
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The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
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Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
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On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
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