A Briefer History of Time Part II

There is a  theory that the universe is forever expanding. Based on data scientists, have discovered that all the galaxies are moving away from us with the ones farther from us moving faster. Now we are not going to make the same mistake of assuming that we are the center of the universe again, but think of the universe as a balloon with dots on the balloon representing galaxies. As the balloon expands all of the galaxies move away from each other. Scientists believe that there are three different theories about what will happen as the universe continues to expand. They also have discovered black holes, which are places in space so incredibly dense that escape velocity to get out of its gravitational field exceeds the speed of light, so even light cannot escape. These black holes simply look like that, a black hole in space with objects orbiting the outside of the event horizon.