Scientist Neil deGrasse Tyson said he does not think we are alone in the universe.
He appeared on C-SPAN’s In Depth to explain how the chemistry of life means it is very unlikely that life could have only evolved on Earth.
He said, “It is not likely we are alone in the universe. If you look at how common the ingredients of life are.
“Hydrogen, oxygen, nitrogen, carbon – we are made of this stuff, it is the foundation of organic chemistry.
“We are carbon based life – this stuff is everywhere we look in the universe.
“Whatever happened on Earth, it’s not likely to be rare or unique. Because carbon chemistry, on which life is based, is the most fertile kind of chemistry there is. And carbon is abundant across the universe.
“The universe has been around 14 billion years – that is plenty of time to evolve all manner of creatures out there, esp microorganisms.”
But, when it comes to aliens visiting Earth in UFOs he is less convinced.
He said: “Have we been visited? That is a different question to ascertaining if life exists
In comments that will shock and anger many in the UFO community, he blasted ufology and said there was not a shred of evidence to support claims of alien visitations.
He said: “What the UFO community puts forth as evidence is weak on a level that, in any scientific circle, would be kicked out of the lab room.”
He said an eye witness testimony of seeing something was not enough, particularly if it was just something unidentified – it was a huge jump to then say it was an alien craft.
He said: “I am not saying didn’t see it – I’m simply saying you cannot present that as evidence for something you want all of us to believe. I need better data.
“And as your claim gets more and more extraordinary, the less confidence I have.
“Now you have taken a picture of something you don’t understand – it is better than eyes, so what is it – it’s unidentified – that is what the U stands for – we don’t know what it is, it’s a mystery.”
He said people were seeing things they didn’t understand that were often circular-shaped lenticular or orographic clouds, but wanted to believe they were a “UFO mothership.”
He said: “If you are susceptible to wanting this to be true, then that is the mothership.”
He even dismissed what, for years ufologists have said to be the smoking gun for alien life – testimonies from military pilots and officials to seeing UFOs.
He said: “I don’t care if you are a military pilot, you are still human and no less susceptible.
“I would love to meet some aliens, but have such low confidence in your claims.
“The day you find an alien – ideally, in fact, bring the alien and you are good to go.”
Mr deGrasse Tyson also dismissed the claims from a growing number of people who give accounts of being abducted by aliens – with no video footage or other evidence.
He said: “Where are the people on YouTube – the postings of people’s footage inside a flying saucer, shaking hands with the aliens?
“If you have been abducted by aliens get some video footage, and get other people to get some video footage.
“Grab something off the shelf – say look what I’ve stolen – take it to the lab to see if it is alien manufactured – we are still waiting for that to happen.”