OJ 287. This is a binary pair of black holes. It contains the most massive black hole known, with a mass estimated at 18 billion solar masses.
The largest discovered black hole is a quazar named OJ287, and it has an estimated mass of 18 billion suns! WOW!
Black hole is a location in space that possesses so much gravity, nothing can escape from its pull. Yes, Super massive black hole is the largest black hole.
Nonexistent.
Uh...the obvious. They produce and reflect no light at all (black) and stuff goes in it (hole.)
There is a game named "Beyond the Black Hole", so if that's what you mean, yes.
A black hole can have anywhere from 2-3 times the mass of the Sun (the lower limit for a stellar black hole), to about 20 billion times the mass of the Sun (the largest known supermassive black holes).
A black hole can definitely get to the size of a planet. The width of the largest known supermassive black hole is thought to be over ten times the size of the entire orbit of Neptune around our Sun.
The only "named" black hole is called "Cygnus X-1", for the first X-ray source in the constellation Cygnus.
Largest in size - VY Canis MajorisLargest in mass - the supermassive black hole at the centre of the Galaxy.
The black hole with a mass of 3 solar masses has the largest radius among the objects listed. This is because the radius of a black hole is determined by its mass and the Schwarzschild radius formula, which dictates that the radius of a black hole increases with its mass.
The largest black holes are supermassive black holes - the black holes at the center of galaxies. The largest known such black hole has somewhere between 20 and 40 billion times the mass of our Sun. It's hard to know which of the observed black holes is really the largest (i.e., the most massive one), since the mass estimates in each individual case are currently not very accurate.
The most relevant quantity is the black hole's mass. Note that the black hole's diameter (the diameter of the event horizon, really) is directly proportional to its mass. The largest galactic black holes known seem to be around 20 billion solar masses. Check the Wikipedia "List of most massive black holes" for more details. Note that the mass of some of these black holes is not very well-known.