香蕉视频

鈥淚t would be very arrogant to think that we're the only species of life in the universe. The universe contains billions of stars, so statistically, it's unlikely [we're alone]. But it's also not likely that we've been visited by extraterrestrials because of the distances involved.鈥澛�Dr. Joe Schwarcz, Director of the聽Office of Science and Society.