The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
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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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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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An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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Lightning strikes about 6,000 times per minute on this planet!
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A car traveling 100 mph would take more than 29 million years to reach the nearest star (to our solar system)
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