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28 April 2009

Impact Crater

In my posts about our field trip to Arizona, I showed my best pictures of meteor crater, but really none of them come close to expressing the feeling of standing on the brink of such a feature and trying to imagine an explosion big enough to carve it out. I just came across a photo by Stan Gaz that does a much better job than my snapshots (click to follow …

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19 March 2009

Meteor Crater, Walnut Canyon, and Red Mountain

(This is day 5 of a week-long planetary geology field trip to Arizona. Get caught up with days 1,2,3,4) Today was a long and awesome day. We started out at meteor crater, the youngest and best preserved impact crater on Earth! Our guide today was Shaun Wright, a colleague from the Hawaii field workshop, among other places. He showed us infrared images of the crater taken from an airplane and …

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1 October 2008

The footprints of a moonlet's demise…

A cool paper just came out in Icarus this week claiming that a crater in the northern plains of Mars may be the result of the impact of a small moonlet of Mars, possibly just smaller than Deimos. Here’s the crater: (Chappelow and Herrick, 2008) Because the crater is so elliptical, and because of the “blowouts” on the eastern edges of the craters (where ejecta actually blew back through the …

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