Strazdas said:
Black hole expanded with mass it sucked. evnetually in the end of its life black hole eats whole galaxy. what we see here, is a big black hole that has ate half of the galaxy, maknig the remaining part look proportionately small. it is likely that "soon" the black hole will finish eating whole galaxy and if it has enough mass, explode and create new stars, if not, then its going to attempt to such neighboars.
what is worrying, is that explosion is very likely to hit our galaxy as well, and thats not nice believe me.
I don't think Black Holes explode, they evaporate.
Virtual particle/anti-particle pairs fizz into existence all the time, and very quickly rejoin and cancel each other out again.
Sometimes at the very edge of a Black Hole one of those pairs falls in, leaving the other to fly off into space. Thusly, to offset the existence of this virtual particle, the Black Hole loses that amount of mass from itself.
Over time, the offset of all these virtual particles causes the Black Hole to gradually lose mass, due to the other particles in this pair to flying off into space, in essence they're "taking" away the mass of the Black Hole with them as they go.
This is Hawking Radiation and explains why a Black Hole evaporates into nothingness, eventually.
(Could imply that Black Holes eventually eat their galaxy, maybe they even grow so large they begin to interact and eventually it's just one galaxy-spanning black hole or BOOM, universe reset. It's a theory at least
