John Wickham of the British UFO Research Association, has told Daybreak that "there is no definitive proof that UFOs exist."
"However, in saying that it's not logical to think that out of the vastness of the planets throughout the universe that some planets do contain the elements of gasses on earth, so logically they can sustain some sort of life," he added.
More top news
A police raid uncovered what is believed to be cocaine that had been stashed in nappies, and 40 cannabis plants.
The prince attended the rugby match in his role as patron of the Invictus Games Foundation, the official charity for this year's game.
The prime minister pitched her comments firmly towards unionists in her first campaign visit to Scotland ahead of the general election.