DICTIONARY LOOKUP
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Space Rocks
Little chunks of rock and debris in space are called meteoroids. They become meteors -- or shooting stars -- when they fall through a planet's atmosphere; leaving a bright trail as they are heated to incandescence by the friction of the atmosphere. Pieces that survive the journey and hit the ground are called meteorites.

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Q
bar

= 0.987 atmosphere = 1.02 kg/cm^2 = 100 kilopascal = 14.5 lbs/square inch.

billion

1,000,000,000

biodiversity

The variety and variability among living organisms and the ecological complexes in which they occur.

bolide

a very bright meteor (or fireball) that produces a sonic boom.

bright terrain

A type of surface on Ganymede which is lighter than other regions on this moon which is often associated with grooves (see also dark terrain).

 
Can't find it? Don't understand it? Ask us.
Q
bar

= 0.987 atmosphere = 1.02 kg/cm^2 = 100 kilopascal = 14.5 lbs/square inch.

billion

1,000,000,000

biodiversity

The variety and variability among living organisms and the ecological complexes in which they occur.

bolide

a very bright meteor (or fireball) that produces a sonic boom.

bright terrain

A type of surface on Ganymede which is lighter than other regions on this moon which is often associated with grooves (see also dark terrain).