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Our Star
The sun is a star, a hot ball of glowing gases at the heart of our solar system. Its influence extends far beyond the orbits of distant Neptune and Pluto. Without the sun's intense energy and heat, there would be no life on Earth. And though it is special to us, there are billions of stars like our sun scattered across the Milky Way galaxy.

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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.