This is a beautiful sheet of 6 stamps, issued by Guinea in 2010, commemorating the 2010 launch of the Japanese Akatsuki Venus Climate Orbiter (VCO) Planet-C space probe. Also honored on the stamps are the European Space Agency's Venus Express exploration mission, NASA's Voyager 1 robotic space probe, the Solar and Heliospheric Observatory (SOHO) spacecraft, the Soviet space probe sent to the Moon Luna 3, the 2001 Mars Odyssey robotic spacecraft, and the Mars Global Surveyor (MGS) US spacecraft. The sheet is Michel catalog #7634-9, and is Post Office fresh, mint never hinged, and F/VF.