Professor Brian Cox says the “alien bodies” displayed at Mexico’s Congress are unlikely to be lifeforms from outer space.
The physicist, 55, hit out at rumours two alleged “non-human” bodies had been found after they were put on show in glass cases during a hearing earlier this week.
He said on X: “They are way too humanoid. It’s very unlikely that an intelligent species that evolved on another planet would look like us.
“Secondly – send a sample off to 23andme – let alone the university down the road - and they’ll tell you within 10 minutes.”
The Mexican congressional hearing where the “aliens” were displayed has also been blasted as an “unsubstantiated stunt”.
Ryan Graves, a former US Navy pilot who in July claimed the number of UFOs or UAPs (Unidentified Anomalous Phenomena) was being “grossly underreported”, was at the meeting where the mummified remains were put on show.
But he blasted on X: “Unfortunately, yesterday's demonstration was a huge step backwards for this issue.
“My testimony centred on sharing my experience and the UAP reports I hear from commercial and military aircrew through ASA's witness program.
“I will continue to raise awareness of UAP as an urgent matter of aerospace safety, national security, and science, but I am deeply disappointed by this unsubstantiated stunt.”
The Mexican politicians were told the specimens were found in the city of Cusco, Peru, and were estimated to be 1,000 years old.
UFO researcher Jaime Maussan testified under oath almost a third of their DNA is “unknown” and the specimens were not part of "our terrestrial evolution”.
Last year marked the 75th anniversary of the Roswell UFO incident.
An extra-terrestrial spacecraft is said to have crashed in the desert of New Mexico in 1947, sparking ongoing conspiracy theories alien bodies were recovered which some believe has been covered up by the US government.