TON 618, a hyperluminous quasar, stands an astounding 10.4 billion light-years away in the far-flung reaches of the Canes Venatici constellation. The cosmic behemoth harbors an ultramassive black hole at its heart, with a staggering mass of 66 billion solar masses – dwarfing our Milky Way's central black hole by a factor of 15,000.
The moniker 'ultramassive' aptly fits TON 618, the most colossal single object yet discovered. The quasar enveloping it shines with an incomparable brilliance, registering a stellar absolute magnitude of -31, which translates to a luminosity 140 trillion times that of our Sun.
The event horizon of TON 618's black hole, the boundary delineating the point of no return, spans an impressive 1300 Astronomical Units (AU) - more than forty times the distance between Neptune and the Sun.
The genesis of such gargantuan black holes remains a cosmic conundrum. The known process of accretion, where mass is accumulated over time, seems insufficient to explain TON 618's immense size, especially considering the relatively young age of the universe when it formed. This mystery hints at potentially unknown mechanisms aiding its rapid growth. As we continue to gaze upon this celestial marvel from our vantage point 10.4 billion light-years away, the enigma of TON 618 continues to challenge our understanding of the universe's grand design.
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