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The Red Planet
Mars is a cold desert world. It is half the diameter of Earth and has the same amount of dry land. Like Earth, Mars has seasons, polar ice caps, volcanoes, canyons and weather, but its atmosphere is too thin for liquid water to exist for long on the surface. There are signs of ancient floods on Mars, but evidence for water now exists mainly in icy soil and thin clouds.

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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).