A light-year distance, if you rely on us to walk, how long will it take to finish it? A light-year distance, if you rely on us to walk, how long will it take to finish it?
Scientists have discovered that the super structure of the universe has reached 520 million light-years. Can human beings go out? Scientists have discovered that the super structure of the universe has reached 520 million light-years. Can human beings go out?