The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
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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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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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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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41% of the moon is not visible from earth at any time.
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Venus is the only planet that rotates clockwise.
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The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
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If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
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