JAXA astronaut Norishige Kanai came back to earth last month but is still dreaming of space, especially after the discovery of an underground lake on Mars brought mankind one step closer to unraveling the mystery of whether life exists on the red planet. "I was so excited about the news," the 41-year-old doctor with the Japan Aerospace Exploration Agency said in an interview Friday, calling it "a major discovery that inspires dreams." International astronomers on Wednesday announced they had detected the largest body of liquid water ever found on Mars, a breakthrough that may hold clues to whether life has ever formed on the planet or even exists today. Kanai, who spent 168 days on the International Space Station, is firmly convinced that we're not alone in the universe and there is life out there. "I believe there is," he said.