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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).