What is a black hole? How can we understand it?
What do we understand about black holes?
Are black holes and singularities related? Why do black holes have gravity? Are black holes singularities? How do we know we are not living in a black hole? Are black holes like sink holes? Why do black holes change? Why can't we find a black hole? What is the difference between black holes and white holes? Is Earth in a black hole? Can a black hole die? Why or why not? How can I explain about black hole and space time to ten year kid? What happens to matter when it enters a black hole? Are black holes portals? What is the event horizon in a black hole? Do all galaxies have a black hole? What is an event horizon of a black hole? Can we kill a black hole? Is it possible to think of black holes as having no spacetime inside the event-horizon? Is there a singularity inside the event horizon of a black hole? Are there an estimates for the amount of dark matter a black hole contains? Do black holes have an atmosphere? Can we artificially create a black hole? How are supernova and black holes related? Could the singularity of a black hole be a graviton? How do black holes disappear? Are we in a larger version of the outflow of a universal black hole? What is the diameter of black holes? Can another black hole exist in a black hole? Where does matter go after falling into a black hole? Does time work in black hole?