Question

do black hole are really invisible or colourful

Answer 1

This may be a really basic question with the simplest of answers, but as much sense as it makes to think that black holes are not, in fact, black but invisible - because light would be gravitationally lensed from all directions around the black hole, 'covering' the hole - I am yet to find an artist's impression portraying the black hole as anything other than, well, a 'black hole' in space. Even the movie 'Interstellar', which is meant to have unimaginably realistic graphics and has undergone a gigantic amount of physical simulations to achieve such, portrays the black hole in that stereotypical manner. Or, perhaps, my intuitive speculations are unjustified?