Former US President Barack Obama has clarified that the chances Earth has been visited by aliens is "low" after comments he made about extra-terrestrial species caught attention online.

Barack Obama is clarifying what appeared to be his confirmation that aliens did exist on a recent podcast.

Obama previously made a similar joke on The Late Late Show with James Corden, saying, “The truth is, that when I came into office, I asked, ‘Is there the lab somewhere where we’re keeping the alien sp...