ISS027-E-036248 (23 May 2011) --- Onboard the International Space Station, European Space Agency astronauts Paolo Nespoli (left) and Roberto Vittori shake hands following an Earth-to-space phone tag-up with Italian President Giorgio Napolitano. Nespoli has been on the station for over five months and is due to return to Earth in less than 24 hours. Vittori is on a 16-day mission of the space shuttle Endeavour, joined by five NASA astronauts. This occasion is the second time two Italian astronauts have been in space together and the first time in the last 15 years.