Astrophysicist Neil deGrasse Tyson was left completely stumped by Demi Lovato's claim that using the term "aliens" when referring to extraterrestrials is "derogatory".

The former Disney Star's new Peacock show, Unidentified with Demi Lovato, sees the singer, their sister, Dallas, and their skeptical friend, Matthew Montogomery, go on the hunt for alien life.

Over the course of four episodes, the trio tries to find out more about possible extraterrestrial life through investigating alleged eyewitnesses, looking into top-secret government records, and even meeting individuals who claim to have been abducted by UFOs.

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Speaking about the term "aliens", Demi believes it's an offensive word that needs to be scrapped.

"I think that we have to stop calling them aliens because aliens is a derogatory term for anything. That's why I like to call them ETs," they told Pedestrian TV.

The term "aliens" has been one of hot debate in recent years, as many have deemed it derogatory to use toward illegal immigrants.

What's more, Lovato said that they're particularly irked by misconceptions that extraterrestrials are "harmful or that they’ll come and take over the planet."

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"I really think that if there was anything out there that would want to do that to us, it would have happened by now," they added.

But Demi's logic seemed to have left the acclaimed astrophysicist baffled.

Speaking to TMZ, the esteemed planetary scientist said: "All the aliens that I've ever met, they have no feelings.

"So to be worried about offending them by calling them an alien, what is she thinking is going on in the head of species of life from another planet? I mean, I know it's very considerate of her, but really? Really?"

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The 63-year-old went on: "When I refer to aliens - just to be specific - I always say 'space aliens'. And then, what we used to call aliens on Earth, undocumented immigrants, that's what the new term is for then, and I'm all in on that.

"So what that means is - if we all do that - the only invocation of the world alien is for creatures from outer space that want to kill us all."

"First, I don't care what they feel. Plus, why should I even believe they know English? So, yeah, I'm not all in on that. I don't get it," he added.

Featured image credit: Erik Pendzich / Alamy

Neil deGrasse Tyson baffled by Demi Lovato's claim we shouldn't call extraterrestrials 'aliens'