He's not backing down.
Most recently, an international team of researchers attempted to dismantle a core aspect of Loeb's argument: that 'Oumuamua was a solar sail, an advanced form of propulsion that would allow a spacecraft to use the low pressure of solar radiation to move through space.Astronomy and Astrophysics
, the team concluded that "'Oumuamua is unlikely to be a light sail. The dynamics of an intruding light sail, if it exists, has distinct observational signatures, which can be quantitatively identified and analyzed with our methods in future surveys.
Of course, extraordinary claims call for extraordinary measures. Maybe the object was nothing more than a cometUnfortunately, it's exceedingly rare to encounter an interstellar object like 'Oumuamua. But given the opportunity, and "with help of a huge amount of highly accurate observation data in the future," as Shangfei and his colleagues argue in their paper, perhaps we could finally put the mystery to rest.
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