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NASA’s Chandra X-ray space telescope tracks colliding galaxies, black holes  AL.comView Full coverage on Google News
Scientists say they have used the telescope to find the first two observable candidates for merging dwarf galaxies that form larger galaxies.

NASA’s Chandra X-ray space telescope tracks colliding galaxies, black holes - al.com

NASA’s Chandra X-ray Observatory helped identify two pairs of dwarf galaxies on track to merge. Dwarf galaxies, which are at least about 20 times less massive than the Milky Way, likely formed larger galaxies through collisions in the early Universe. These newly-discovered merging dwarf galaxi

NASA Tracking Supermassive Black Holes on Collision Course

Astronomers used NASA's Chandra X-ray Observatory to spot two pairs of gigantic black holes set for two separate, first-of-their-kind collisions.

2 pairs of gigantic runaway black holes spotted on collision course, and they're bringing four entire galaxies with them | Live Science