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Science fiction writers love wormholes because they make the impossible possible, linking otherwise unreachable places together. Enter one, and it’ll spit you back out in another locale—typically one that’s convenient for the plot. And no matter how unlikely these exotic black hole relatives are to exist in reality, they tend to fascinate physicists for exactly the same reason. Not long ago, some of those physicists took the time to ponder what such a cosmic shortcut might look like in real life, and even make a case that there could be one at the center of our galaxy.
The most surefire way to confirm a wormhole’s existence would be to directly prod a black hole and see if it’s hiding a bridge to elsewhere, but humanity may never have that opportunity. Even so, researchers could rule out some of the most obvious scenarios from Earth. If the monster black hole residing in the churning center of the Milky Way, for instance, is more door than dead end, astronomers could tease out the presence of something on the other side. Black hole researchers have tracked the orbits of stars, such as one called S2, circling this galactic drain for years. Should those stars be feeling the tug from distant doppelgängers beyond the black hole, they’d perform a very particular dance for anybody watching, according to a recent calculation.
“If astronomers just measure the orbit of S2 with higher precision so that we can narrow it down [and notice such a dance],” says Dejan Stojkovic, a theoretical physicist at the University at Buffalo who helped calculate the result, “that’s it. That’s huge.”
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