- uploaded: Oct 6, 2008
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The above is a photograph of Mars provided by the Hubble Space telescope. The central depression/crater is visible right at the Martian North Pole. It is about 10% of the diameter of the entire planet, a huge crater. It is deep, shockingly deep. And the reader will note that it is practically empty, as even some orangish ground can be seen at the bottom along with some residual ice. This tells us that the above picture is a picture of the Northern Martian hemisphere in the summer, as the â?? ice cap â?? has largely melted and the crater is empty.
A polar depression such as the one which we see at the top of Mars, is simply a natural result of the planetâ??s formative process. The amount of centrifugal force which would have been necessary to impose the almost perfect roundness upon the exterior surface of the planet would have surely opened up a cavity within. Matter would have been drawn towards the equator, making the equatorial region thicker, leaving the crust at the axial points thin- or even ruptured- at the top.
The traditional explanation that the polar depressions on Mars ( and other planets ) are actually huge impact craters is not tenable. An impact crater would have a depth which corresponds to its diameter, which this one doesn't have. An impact capable of producing a depression which is a significant percentage of a planet's diameter would break the planet asunder. And how do we explain the fact that Mars has two similar craters at the polar points, nearly the exact opposite of each other?