This artist's impression shows the Cygnus X-1 binary star system, one of the brightest X-ray sources in the sky. Data suggest that there is a small, very dense object about nine times the mass of the sun in this star system. The object could be a black hole, but, strangely, it appears to have formed without a supernova.
This image of the International Space Station (ISS), with Earth as a backdrop, was taken from Space Shuttle Discovery on Sept. 8, 2009, as the two spacecraft began their relative separation.
President Dmitry Medvedev says Russia will spend $600 million on a nuclear-powered spacecraft to take men to Mars, and beyond. Is it safe?
Though its program is nothing like it once was, the country uses its fleet of rockets to ferry tourists and satellites into orbit.
Former Microsoft software developer Charles Simonyi flies during a parabolic flight aboard a zero-gravity simulator, a Russian IL-76 MDK aircraft used for astronauts' training flights in weightlessness, in Star City outside Moscow, on Feb. 26, 2007. As the world's fifth space tourist, Simonyi blasted off to the International Space Station on April 7, 2007.