On Thursday, President Trump directed his administration to release files on UFOs and any "alien and extraterrestrial life," an issue that has drawn decades of public fascination and debates over if we are really alone out there. Dr. Erin Macdonald, who is the science advisor for Star Trek, explains the real science behind the headlines. "We have not confirmed any life outside of our own planet, either existing now or existing in the past, but the odds are great," she tells CBS News' Dave Malkof