It may be that the entire universe was a massive star. Suddenly this massive star burst into a supernova and ultimately formed a void or a giant blackhole, what we are now calling space or void. After that in this space or void, atoms, other fundamental particles, matters and ultimately stars and planets are created. So, in a sense we are living inside a giant blackhole, what we call space. All galaxies, stars, planets and other visible blackholes including us may be residing inside this super massive giant blackhole formed around 13.8 billion years ago.