Senin, 22 April 2013

15 Facts About Our Planet for Earth Day

3) The Earth has a mass of 6 000 000 000 000 000 000 000 000 kilograms or if you prefer 6 sextillion tons. In pounds that s actually 0. Nothing. Mass is a measure of how much stuff an object contains but weight is how hard gravity pulls on that mass. The Earth is in space orbiting the Sun so it s in freefall. It has mass but no weight at all.

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