"We hope to come back on Earth on Monday, but if we have to wait, then we'll wait for another day". With these words Carl Walz, the Us astronaut who, together with his compatriot Daniel Bursh and the Russian commander Yuri Onoufrienko, spent 193 days (Us stay in orbit record, editor's note) on the International Space Station Alpha, commented the possibility today's Endeavour coming back on Earth, scheduled...