The second U.S. Mars Rover, Opportunity, is sending back some pretty spectacular pictures, showing possible evidence of water and former life on the Red Planet. The first rover, Spirit, after being disabled by computer problems, is back on its feet and exploring too. The successful mission should be an inspiration for the space-faring nations of the world--a community that is growing fast. No one comes close to NASA's $15.5 billion annual budget. But here's a look at who else is trying to make a mark in space.
--By Nadia Mustafa
BUDGET: $53.6 MILLION One of its satellite rockets exploded on...