Since then, Loeb has advanced the "tantalizing possibility" that 3I/ATLAS was "sent towards the inner solar system by design" and could even be releasing "mini-probes" to explore further.
That's despite a growing consensus that the object is a comet, a ball of ice and dust that off gases material as it screams closer to the Sun.
Loeb has already made waves in scientific circles for asserting that 'Oumuamua, the first interstellar object ever identified back in 2017, may have been sent to us by an alien civilization.
For his more recent claim, Loeb has pointed to 3I/ATLAS' unusual chemical makeup, its peculiar path taking it close to the orbits of Mars and Jupiter, and its enormous suspected size.
But as NASA's lead scientist for solar system small bodies, Tom Statler, told The Guardian that it's far more likely to be a comet.
"It looks like a comet," he said. "It does comet things. It very, very strongly resembles, in just about every way, the comets that we know."
"It's a comet," he concluded.
However, Statler conceded that 3I/ATLAS has "some interesting properties that are a little bit different from our solar system comets."
The NASA scientist explained that the way comets react once they're being hit by the Sun's radiation is "a bit unpredictable."
"So even in our solar system, comets can have a history of suddenly brightening if there’s, say, a particular pocket of ice that sublimates quickly and drives off a large amount of dust," he told the Guardian.
While we've only spotted three interstellar visitors so far, it's almost certain that 3I/ATLAS won't be the last.
"It’s not that they’re really anything new, but we’ve just recently had the ability to discover them," Statler told the paper. "This gives us a window we’ve never had before, directly into the composition of other solar systems."
Loeb himself has acknowledged that 3I/ATLAS may not be the technological remnant of an extraterrestrial civilization he's proposed.
"The simplest hypothesis is that 3I/ATLAS is a comet and we are missing the spectral features of its gaseous coma because of its large distance from Earth," he admitted in a July 12 blog post.
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