Harvard Astrophysicist Avi Loeb Suggests Interstellar Object 3I/ATLAS Could Contain Antimatter, ‘The Most Efficient Fuel’

Harvard Astrophysicist Avi Loeb's Theory on 3I/ATLAS

Avi Loeb, a Harvard astrophysicist, has suggested that the interstellar object 3I/ATLAS could contain antimatter, which he describes as

"the most efficient fuel" in the universe
.

Loeb's idea, presented in a Medium essay, proposes that the interaction between antimatter and solar particles could explain the object's unusual brightness and apparent acceleration.

According to Loeb, if 3I/ATLAS indeed contains antimatter, its passage through the solar wind might generate detectable gamma-ray or X-ray emissions, which could be observed by NASA's Fermi Gamma-Ray Space Telescope.

Author's summary: Avi Loeb suggests 3I/ATLAS may contain antimatter.

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Business Times Business Times — 2025-11-03

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