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The Swiftest Planet
Sun-scorched Mercury is only slightly larger than Earth's moon. Like the moon, Mercury has very little atmosphere to stop impacts, and it is covered with craters. Mercury's dayside is super-heated by the sun, but at night temperatures drop hundreds of degrees below freezing. Ice may even exist in craters. Mercury's egg-shaped orbit takes it around the sun every 88 days.

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 Kelvin (K) 0 Kelvin is absolute zero; Water Ice melts at 273 K (= 00C = 320F); Water boils at 373 K (= 1000C = 2120F).
 Kepler, Johannes (1571-1630) German astronomer and mathematician. Considered a founder of modern astronomy, he formulated the famous three laws of planetary motion.
 kilogram (kg) = 1000 grams = 2.2 pounds, the mass of a liter of water.
 kilometer (km) = 1000 meters = 0.62 miles.
 kinetic energy The energy of motion; equivalent to one-half an objects mass multiplied by its velocity squared.

Can't find it? Don't understand it? Ask us.
 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 Find entries starting with containing
 Kelvin (K) 0 Kelvin is absolute zero; Water Ice melts at 273 K (= 00C = 320F); Water boils at 373 K (= 1000C = 2120F).
 Kepler, Johannes (1571-1630) German astronomer and mathematician. Considered a founder of modern astronomy, he formulated the famous three laws of planetary motion.
 kilogram (kg) = 1000 grams = 2.2 pounds, the mass of a liter of water.
 kilometer (km) = 1000 meters = 0.62 miles.
 kinetic energy The energy of motion; equivalent to one-half an objects mass multiplied by its velocity squared.