âoeâ¦one with no star orbiting itâ¦â I admit, Iâ(TM)m no astrophysicist, but I thought a black hole was a star in its final stage of life. Is that not the case?
No, a black hole is a black hole, typically originated from the collapse of a massive star. It may have started as a star, but once it reaches about ~4.34 × 1030 kilograms (about 2.17 times the mass of our sun) it exceeds the Chandrasekhar limit and collapses into a black hole, which is way more dense than any star and does not emit light as light cannot escape its mass.
"In order to make an apple pie from scratch, you must first create the universe." -- Carl Sagan, Cosmos