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In about 70,000 years, the two massive black holes in this galaxy will collide and release a tremendous burst of gravitational waves.
For now, we can detect them because they blast out light & x-rays each time they waltz through a nearby gas cloud.
https://www.aanda.org/articles/aa/full_html/2024/12/aa51305-24/aa51305-24.html #science #nature