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December 30 2012

Mars Astronauts Likely to Witness 1 Megaton Asteroid Impacts


Asteroid impacts are among the most feared of natural catastrophes. So estimating the risk they pose to humanity is an important task.

One method is to look at the number of impacts in the past and use this as a guide to the future. This isnít entirely straightforward since the distribution of crater sizes we see today depends not only on the rate of impact in the past but also on the rate of disappearance via processes such as erosion, tectonic changes, obliteration by other craters and so on.

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