NASA Mars weathercam helps find big new crater
Researchers have discovered on the Red Planet the largest fresh meteor-impact crater ever firmly documented with before-and-after images. The images were captured by NASA's Mars Reconnaissance Orbiter. The crater spans half the length of a football field and first appeared in March 2012. The impact that created it likely was preceded by an explosion in the Martian sky caused by intense friction between an incoming asteroid and the planet's atmosphere.<img src="http://feeds.feedburner.com/~r/sciencedaily/~4/KwhzKjJtdzo" height="1" width="1"/>
