What if some of the alien worlds we’ve discovered are not actually planets at all?
Astronomers have spent years cataloging thousands of worlds orbiting distant stars, assuming that if something has the mass of a planet and exerts a gravitational pull on its parent star, it must be a planet.
But there may be a ghostly alternative lurking in the early universe. In a recent paper that was uploaded to the arXiv preprint server but has not been peer-reviewed, researchers suggest that some “exoplanets” we’ve detected might actually be something far more exotic — primordial black holes.
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