According to Stephen Hawking, black holes as we currently understand them do not exist. Artists impression of a black hole of ten solar masses as seen from a distance of with the Milky Way in the background.
Swift Maps a Star's 'Death Spiral' into a Black Hole
Actually we would notice bc the side of theart facing the sun would get much warmer.<< But if the whole universe became bigger then the sun would too. So you wouldn't feel warmer because it's still the same