The answer is; There is a supermassive black hole that is about 15 million miles across
This supermassive black hole is called Sagittarius A* and is 14 million times the size of the sun. Most galaxies have a supermassive black hole in their center like the Milky Way. The earth is 26,000 light-years light from the black hole (within the arms of the galaxy) hence far enough from its annihilating force.