Episode Details

An interstellar comet, 3I/ATLAS, zipped past Earth last year and may be nearly 12 billion years old—older than our solar system. Only the third known visitor from beyond our solar system, it’s a cosmic fossil with a chemical makeup unlike anything in our neighborhood, including ten times more deuterium than our comets. Scientists believe it formed in frigid regions colder than anything in our solar system, possibly during the galaxy’s “cosmic noon.” While some speculated it might be alien tech, NASA confirmed no evidence of that. The comet is now heading back into the void, but its discovery marks a thrilling step toward understanding what’s out there—and more cosmic travelers are expected to arrive as new observatories come online.

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