How big is the universe?

95 ✅ Answers ? Favorite Answer The universe is about 13.7 billion years old. Light reaching us from the earliest known galaxies has been travelling, therefore, for more than 13 billion years. So one might assume that the radius of the universe is 13.7 billion light-years and that the whole shebang is double that, or … Read more

Do the radio waves we send into outer space keep going forever, or do black holes suck the radio waves alot?

“Will we ever make contact with aliens ? Since the advent of broadcast radio, radio signals leaving Earth have traveled about 50 light-years, or 3 trillion miles. But our Milky Way galaxy alone is 6,0 trillion miles across. So those radio signals would have to go for centuries more before they even got a small … Read more