New probe: hidden northern hemisphere of Mars crater.

<P Align=center> </ P> <P> 13, the European Space Agency announced the "Mars Express" probe latest discovery: the lowlands and plains in the northern hemisphere of Mars, the buried many of diameter between 130-470 km .huge craters. .The startling discovery for understanding the formation history of Mars provide important information. .</ P> <P> ESA "Mars Express" probe MARSIS Subsurface Radar pointed out that the person in charge of Picardy, northern and southern hemisphere of Mars surface were significantly different, the plateau was almost covered the southern hemisphere and around the crater of the impact basin is similar to .(also known as impact craters), but the surface is relatively flat northern hemisphere lowlands and plains. .</ P> <P> the type of large-scale subsidence pits are usually produced by the impact, geological changes often can erase the traces of collision, so the formation of craters smaller area relatively short history. .As the northern hemisphere of Mars surface smooth, so the Northern Hemisphere surface is relatively young, but the latest data show that the underground exploration than the old surface and the formation of the southern hemisphere may be as old as time, can be traced back to about 40 billion years ago, Noah's discipline. .</ P> <P> experts point out that many of the solar system planets are impact craters formed in the Early Noah, which is made by the celestial collision, but because of weathering erosion and other factors, have been hit the Earth billions of years ago .resulting from many of the traces had disappeared, and the impact on Mars traces of the scientific community for the evolution of the Earth provide important clues. .</ P> </ p>.