Harvard astrophysicist Avi Loeb suggests that the interstellar object 3I/ATLAS could contain antimatter, which he describes as "the most efficient fuel" in the universe.
Antimatter is "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.
Loeb suggests that NASA's Fermi Gamma-Ray Space Telescope could observe these signals if 3I/ATLAS truly contains antimatter.
Author's summary: Avi Loeb theorizes 3I/ATLAS may contain antimatter.