Sending humans to Mars with return tickets is technically and medically possible, but Russia cannot muster up the funds and resources necessary for such a costly program on its own, officials and experts said. “There are no obstacles that cannot be overcome from the medical point of view. Problems exist, but there are approaches toward solving them,” Anatoly Grigoryev, director of the Moscow-based Institute for Biomedical Problems, told SPACE.com. In a statement issued to SPACE.com on Thursday through his press service, Grigoryev noted that Russia has already acquired expertise in keeping human beings in space long enough for a voyage to Mars and back.