The Manhattan-sized interstellar object 3I/ATLAS exhibited signs of non-gravitational acceleration and appeared “bluer than the Sun” as it passed our local star — which could be signs of an alien craft “engine,” according to Harvard astrophysicist Avi Loeb.

The object’s non-gravitational acceleration was recorded by NASA this week and indicated a dramatic outgassing which would be expected from a comet — and would mean the object would lose half its mass and exhibit a huge plume of debris in the coming months.

Loeb suggested in a recent paper that the acceleration, along with the object’s startlingly blue appearance, could be signs of an artificially constructed craft.

“Alternatively, the non-gravitational acceleration might be the technological signature of an internal engine,” he w

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