What are some generally unknown things about black holes?
What is still unknown about black holes?
Is a black hole really a hole? How do black holes disappear? What does a black hole look like? What are some ways in which a black hole can disappear? Can another black hole exist in a black hole? Are black holes singularities? Are there an estimates for the amount of dark matter a black hole contains? What is it like in a black hole? Are black holes and singularities related? What does a black hole consist of? Do black holes disappear eventually or will it keep getting bigger? Is anything left behind after a black hole dies? Can a black hole become a star again? Why do black holes change? What is the event horizon in a black hole? Is there a singularity inside the event horizon of a black hole? What do scientists think is inside of a black hole or on the other side? Can a black hole die? Why or why not? Are we inside a black hole? Is it possible to think of black holes as having no spacetime inside the event-horizon? Do we live inside a black hole? Are black holes like sink holes? Do all galaxies have a black hole? How small can a black hole be? Is there a saturation limit for a black hole? How are black holes born? What might have happened if we survived the black hole? What is a black hole singularity? How black holes are formed? Is Earth in a black hole?