The Universe

Black Holes

Do black holes really exist?

Yes, black holes most certainly exist. For many years after the properties of black holes were hypothesized, astronomers were not sure if black holes did exist. Starting in the 1970s, observational evidence began to show conclusively that black holes do populate the galaxy and the universe. Today, thousands of black holes are known to exist, and the total population of black holes in the universe numbers in the many billions.


This is a web preview of the "The Handy Astronomy Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App