The latest campaign, known as O4, began on May 24.
But even two detectors might reap a bounty of science. With upgraded sensitivity, the detectors can pick out weaker or more distant gravitational waves. That means scientists can pick up more events.
And with more events, they hope to begin answering a looming question: Where did the black holes they're seeing tend to form? Perhaps black holes formed inside galaxies; perhaps they formed outside, in globular clusters or in dwarf galaxies. Or, perhaps, they're primordial, having formed in raw space at the beginning of the universe.
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