Ex-Astronaut Casts Doubt on Space Tourism PRAGUE, Czech Republic -- Eugene Cernan, the last man to walk on the moon during the final Apollo landing, said Thursday he doesn't expect space tourism to become reality in the near future, despite a strong demand.   Cernan, now 70, who was commander of NASA's Apollo 17 mission and set foot on the lunar surface in December 1972 during his third space flight, acknowledged that "there are many people interested in space tourism."     But the former astronaut said he believed "we are a long way away from the day when we can send a bus of tourists to the moon." He spoke to reporters before being awarded a medal by the Czech Academy of Sciences for his contribution to science...