Renowned Harvard astrophysicist Professor Avi Loeb has raised serious concerns about the proliferation of AI-generated misinformation after YouTube took down a fake channel impersonating him. The channel had published fabricated videos about the interstellar object 3I/ATLAS, spreading misleading claims to millions of viewers.

Loeb, who leads Harvard’s Institute for Theory & Computation, said the rise of synthetic media poses a grave threat to public understanding, comparing AI-generated misinformation to “junk intellectual food” harmful to society’s mental health.

‘Our perception of reality must be based on verified facts’

In recent interviews, including appearances on the Will Cain Country and Danny Jones podcasts, Loeb criticised growing online narratives — from simulation theory to artificially generated science videos — for encouraging detachment from real-world responsibility.

He said that treating life as a computer simulation is a “luxury belief” embraced by wealthy individuals disconnected from real-world struggles.
“Those of us who struggle to balance our bank accounts cannot afford to ignore reality,” he said, noting that science is meaningful only when grounded in observable facts rather than digital illusions.

Fake AI videos impersonating him triggered global concern

The now-removed YouTube channel had used AI tools to generate videos featuring an avatar of Loeb discussing 3I/ATLAS. The impersonation became apparent when viewers noticed inconsistencies — including a frozen background clock and the absence of injuries Loeb sustained in a recent accident, visible in his real interviews.

In an email to YouTube, Loeb wrote:

  • The fake channel misrepresented his scientific views
  • It contradicted essays read by more than 5 million people in November alone
  • A news outlet mistakenly used the AI-generated footage in a report, blending truth and fiction
  • The impersonation violated YouTube’s Terms of Service
  • The creators could be liable for defamation

Loeb and his followers filed multiple reports before YouTube finally removed the channel.

YouTube responds only after legal escalation

According to Loeb, the takedown occurred shortly after he directly contacted YouTube’s Legal Support team and consulted advisors at Harvard University about possible legal action.

“YouTube removed the channel shortly after receiving my message,” he said, adding that the delay had already enabled misinformation to spread widely.

The professor noted ironically that NBC News had asked him for a copy of the fake clips — which he no longer possessed — but fortunately, one had already aired in a previous news segment where the journalist mistakenly believed it was authentic.

“Thank God for bad reporting,” Loeb remarked, referring to the unintentional preservation of evidence.

Loeb urges stronger governance as AI misinformation grows

The astrophysicist emphasised that society must prioritise verified facts over seductive AI-generated narratives. He warned that:

  • AI makes it easy to fabricate scientific claims
  • Deepfakes distort public understanding of research
  • Platforms must respond faster to impersonation and false content
  • The boundary between real science and synthetic media is rapidly narrowing

Loeb described science as a tool for discovering truths grounded in the physical universe — particularly important as humanity contemplates questions such as the existence of extraterrestrial life.

“If we have cosmic neighbours, we’d better know it,” he said, “regardless of what is trending on social media or computer games.”