Hypernova (explosion of a star)
enormous amount of energy released in the way of bursting of gamma rays ,x-rays,the mass of the star is changed into a blackhole,at the place of star explosion the exploded gas molecules and dustparticles combined togethor as a blackhole due to mass of that exploded star'score
In our solarsystem, almost the sun have a higher mass more than 95% of mass and the remaining 5% or less than 5% contains planets,spacejunk,astroids,satellites etc
Our sun is not going to a blackhole it became a redgaint star.
More than 100 times of soloar mass then only blackholes will evoloved
Some stars will evolve like as white dwarf, at the ending stage of star,
(after destroyed) it contains a small amount of mass in it these mass changes a whitedwarf combineing of gases and core of that star changed in sphere shape.
Blackholes are not visible completely located in deepspace we know that any object can refelect by light then only we can see the object
Here these blackholes doesnot refelect light it observe lightphotons
Photons are energy particle some millions of photons combined togethor a light ray is produced
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