When an interstellar object tumbles through our cosmic neighbourhood, it's bound to cause a stir. But the object known as 3I/ATLAS has done more than that; it has ignited a fierce debate between some of physics' most public figures.
At the heart of the controversy is Harvard astrophysicist Avi Loeb, who famously made similar claims about the first known interstellar object, 'Oumuamua. He has speculated that 3I/ATLAS could be an alien probe.
