DICTIONARY LOOKUP
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Icy Travelers
Comets are cosmic snowballs of frozen gases, rock and dust roughly the size of a small town. When a comet's orbit brings it close to the sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that stretches away from the sun for millions of kilometers.

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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.
Q
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.