![In a collaborative effort between NASA's three Great Observatories, astronomers have solved a cosmic mystery by identifying some of the oldest and most distant black holes. The two rows of this image In a collaborative effort between NASA's three Great Observatories, astronomers have solved a cosmic mystery by identifying some of the oldest and most distant black holes. The two rows of this image](https://c8.alamy.com/comp/KRJ7DB/in-a-collaborative-effort-between-nasas-three-great-observatories-KRJ7DB.jpg)
In a collaborative effort between NASA's three Great Observatories, astronomers have solved a cosmic mystery by identifying some of the oldest and most distant black holes. The two rows of this image
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