'Oddly' shaped Mars crater is studied
Paris (UPI) Mar 4, 2011
European scientists say an image of an odd, elongated crater on Mars suggests it was carved out by a train of objects hitting the surface at a shallow angle.
The image was one of many returned by the European Space Agency's Mars Express probe of the planet's heavily cratered southern highlands, an ESA release said Friday.
The unnamed elongated crater is about 48 miles long, opens from just under 6 miles wide at one end to 15 miles at the other, and is more than a mile deep at it deepest point.
Impact craters are generally round because the projectiles that create them are driven deep into the ground before the shock wave of the impact can explode outwards, researchers say.
At the elongated crater, the surrounding blanket of material thrown out by the impact, known as the "ejecta blanket," is shaped like a butterfly's wings with two distinct lobes, suggesting at least two projectiles, possible halves of a once-intact body, created the crater, scientists say.
The formation of such elongated features is not over, researchers say; the martian moon Phobos will plow into the planet in a few tens of millions of years, breaking up in the process and likely creating new elongated craters across the planet's surface.
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Paris, France (ESA) Feb 08, 2011
ESA's Mars Express has returned new views of pedestal craters in the Red Planet's eastern Arabia Terra. Craters are perhaps the quintessential planetary geological feature. So much so that early planetary geologists expended a lot of effort to understand them. You could say they put craters on a pedestal. This latest image of Mars shows how the Red Planet does it in reality. Craters are th ... read more
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