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Astronomers Unravel 40-Year Mystery of Co-Orbiting Black Holes

10/22/2025

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Summary

Story summary

Astronomers observed two co-orbiting black holes in quasar OJ287, 4 billion light-years away, resolving a 40-year-old mystery.
Sagittarius A*, the Milky Way's central supermassive black hole, has a mass of 4.3 million solar masses.
Researchers used the Event Horizon Telescope and ALMA to study these phenomena and reveal accretion-disk dynamics.
The findings advance understanding of black hole behavior and their role in galaxy formation.

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Story summary

Astronomers observed two co-orbiting black holes in quasar OJ287, 4 billion light-years away, resolving a 40-year-old mystery.
Sagittarius A*, the Milky Way's central supermassive black hole, has a mass of 4.3 million solar masses.
Researchers used the Event Horizon Telescope and ALMA to study these phenomena and reveal accretion-disk dynamics.
The findings advance understanding of black hole behavior and their role in galaxy formation.