The Radius of the Observable Universe

Most distant objects travelling at the speed of light would be 13 point five billion ears, billion lightears away from us. So what we find is that the radius of this observable universe is not 13 point 5 billion light years. It's actually about forty five, forty five billion light years in in radius. Because the universe is expanding. And every single day that passes there are certain parts of the observable universe that disappear forever. Eventually, in the distant future, the observable universe will be simply the milky way. We'll be able to observe nothing beyond that. One day, one day, only the solar system will be left.