posted on Jan, 23 2004 @ 11:59 AM
Our home, Planet Earth, is a very wet place. In contrast, our neighbor, Mars, is a desert.
Three-quarters of Earth's surface is covered by water. It's mainly in liquid form, though ice exists over the northern and southern polar oceans and
water vapor is present in the atmosphere.
Being 93 million miles from the sun, conditions are such that water "sticks" to our planet. All three phases can coexist, so water remains a
Dating of meteorites indicate that our solar system is about 4.6 billions years old. The older sedimentary rocks, formed through processes requiring
water, are about 3.9 million years old.
Water must have been present at least that long ago then. It is not clear where this water came from, but the traditional view has been that it was a
byproduct of planetary cooling, our seas resulting from the condensation of water vapor originating in the rocks of the Earth's crust.
In the last decade, some new and radically different ideas have emerged from the scientific community, particularly from University of Iowa
astrophysicist Louis A. Frank.
I've heard this theory before, that ice, particularly the polar caps could've been the result of asteroids hitting the earth, or other planets at
the formation of the Universe. Have you heard this before, and if so do you think it has much credibility?