Mars Express Successfully Deploys Marsis First Boom

Sort of geo-radar. One of the most interesting instruments onboard the European probe orbiting Mars (increased importance after some recent finds).

links:

http://news.bbc.co.uk/2/hi/science/nature/4516535.stm

http://science.slashdot.org/science/05/05/08/0348213.shtml?tid=226&tid=160&tid=14