Soil, Comets, and Craters

8 Dec 2012

At ... we learn the Curiosity Rover has taken samples and analysed some soil on Mars - see also

At ... is about Sun grazing comets, in particular, Comet Lovejoy which in December 2011 swept through the Sun's corona with it's long tail stetched out behind - and lived to tell the tale.

Finally, at ... what created all those gullies on the asteroid, Vesta? These are found on the walls of geologically young craters - nice images sent back by the Dawn spacecraft.