Wednesday, July 11, 2007

Fun Fact

A tour of the Solar System!


From http://www.psi.edu/sji/ed/spcfact.html


The Earth has the highest average density (5.52 g/cubic cm) of any planet in our Solar System. Saturn has the lowest (0.69 g/cubic cm). For reference, the density of liquid water is 1 g/cubic cm.

A Jupiter day, the time required for the planet to rotate once, is only about 10 hours long. Jupiter has the shortest day (rotation period) of any planet in the Solar System.

The main constituent of the Martian atmosphere, carbon dioxide, actually freezes on the surface during the winter, particularly in the polar regions. This can cause global atmoshperic pressure changes. On Earth, water freezes out, but is a minor constituent in the atmosphere.

Did you know that water ice may exist in the bottoms of craters at Mercury's poles, based upon radar data taken in recent years. Even though Mercury is the closest planet to the Sun, and extremely hot over most of its surface, ice may exist at the bottoms of some polar craters because the crater floors are permanently shadowed by the crater rims.

The planet Uranus was discovered by the eminent English astronomer William Herschel in 1781. He briefly considered naming the planet George in honor of England's King George III.

The atmospheric pressure you would experience on the surface of Venus is approximately equal to the pressure you would experience 3000 feet (approx. 1 km) down in the Earth's oceans, i.e., about 90 times the pressure at the Earth's surface

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