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| LIGO has discovered a new population of black holes (blue) with masses that are larger than what had been seen before with X-ray studies alone (purple). The three confirmed detections by LIGO (GW150914, GW151226, GW170104), and one lower-confidence detection (LVT151012), point to a population of stellar-mass binary black holes that, once merged, are larger than 20 solar masses: larger than what was known before. Credit: LIGO/Caltech/Sonoma State (Aurore Simonnet) |
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