No. We have never even directly observed a black hole; only the effects of what we think are black holes. The nearest black holes are many light years away, much farther than we have ever been eable to explore. We can only observe through telescopes.
If by "explore" you mean to actually go there, near the black hole, that simply isn't possible with current technology. The nearest known black hole is at a distance of 3000 light-years.
no one knows
Pick anyone and there will be black hole in it.
Anything and anyone that ventures too close to a black hole can be pulled into it.
No. Why would anyone think so?
Yeah magic Johnson was said to have conquered the black hole. That's how he got 'magic' in his name. 2012 Olympics.
No, you'd die from tidal forces and ionizing radiation long before you crossed the event horizon and entered the black hole itself.
Observing a dazzling light from a black hole is impossible because anything cannot come out of black hole once after entering it's event horizon (even light) because black hole very very very strong gravitational field.
To unlock the Black Hole on Spectrobes, you first need to defeat all regular Krawl in the game. Once this is done, travel to the location of the Black Hole on any planet. A cutscene will then trigger, and the Black Hole will be unlocked for you to enter and explore.
An "event horizon." This is the range from the black hole at which not even light can escape the pull of gravity. If the black hole is low-mass, this will be sharp, but the horizon of a supermassive black hole might have stars, worlds and people inside going on about their business. However, none of this could be known to anyone outside the horizon.
Nobody went to any black hole, I can tell you that. If anyone were to go into one, they would be spaghettifyed! Also, if anyone made it into a black hole and went down all the way and came back out to live to tell the story, they'd go down in history.
No known person has been through a black hole. The nearest known stable (stellar mass) black hole is too far away for us to reach with our current technology, and an encounter with one would almost certainly be fatal.