"Venus Express has completed an 'aerodrag' campaign that used its solar wings as sails to catch faint wisps of the planet's atmosphere. The test used the orbiter as an exquisitely accurate sensor to measure atmospheric density barely 180 km above the hot planet."
Venus? What? Somebody still studies that planet? Yes, and in fact there's an active spacecraft there: Venus Express, the poor little sister to Mars Express (itself the poor little brother to Rosetta). Venus Express probably gets the least respect of any ESA planetary mission, but if today's announcement stands the test of time, Venus Express will get credit for a major shift in our understanding of Venus' geology. Today's announcement ....