Heaviest Known Black Holes by Mass

The ultramassive black hole in the Cosmic Horseshoe system boasts a staggering 36 billion solar masses, while TON 618 is estimated at 66 billion solar masses, making them among the largest known.

Sources

• discovermagazine.com
• sci.news
• 'Most massive black hole ever discovered' is detected | The Royal Astronomical S
• The biggest black hole ever seen? Scientists find one with mass of 36 billion su
• techexplorist.com
• science.nasa.gov

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