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Mars-Chroniken - MRO erfasst "frischen Volltreffer" Impact Crater

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The impact ejecta rays and crater are beautifully resolved by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter on Nov. 19, 2013.

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In May 2012, NASA’s Mars Reconnaissance Orbiter’s low-resolution Context Camera spotted something different in the Martian landscape — a fresh impact crater. On comparison with earlier imagery of the same location near the planet’s equator, mission scientists have been able to determine that this is evidence of a very recent impact event, which occurred some time between July 2010 and May 2012.

As the MRO passed over the same region on Nov. 19, 2013, the High-Resolution Imaging Science Experiment (HiRISE) camera was trained on the location to capture this beautiful high-resolution view.
The crater is one of an estimated 200 meteorite impacts that Mars receives per year and this one is certainly one of the most striking. It appears to be a single meteorite that slammed into the Martian surface, carving out a 30 meter-wide crater and blasting material as far as 9.3 miles (15 kilometers) away.
Mars supports a significantly thinner atmosphere than Earth, and will therefore be less effective at burning up smaller asteroids as they enter the atmosphere as meteorites. The impact ejecta will therefore be thrown over a wider area than if the impact occurred on Earth. Although there are slow weather-driven erosion processes on Mars, countless impact craters scar the planet, signs of a violent relationship with its interplanetary environment.
Quelle: D-News
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A Spectacular New Martian Impact Crater

A dramatic, fresh impact crater dominates this image taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter on Nov. 19, 2013. Researchers used HiRISE to examine this site because the orbiter's Context Camera had revealed a change in appearance here between observations in July 2010 and May 2012, bracketing the formation of the crater between those observations.

The crater spans approximately 100 feet (30 meters) in diameter and is surrounded by a large, rayed blast zone. Because the terrain where the crater formed is dusty, the fresh crater appears blue in the enhanced color of the image, due to removal of the reddish dust in that area. Debris tossed outward during the formation of the crater is called ejecta. In examining ejecta's distribution, scientists can learn more about the impact event. The explosion that excavated this crater threw ejecta as far as 9.3 miles (15 kilometers).

The crater is at 3.7 degrees north latitude, 53.4 degrees east longitude on Mars. Before-and-after imaging that brackets appearance dates of fresh craters on Mars has indicated that impacts producing craters at least 12.8 feet (3.9 meters) in diameter occur at a rate exceeding 200 per year globally. Few of the scars are as dramatic in appearance as this one.

Quelle: NASA
MRO
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