How many galaxys are there? – The Answer Wall

Estimates vary. A lot. Space.com reports that the range accepted by many astronomers is 100-200 billion (bit.ly/galaxies-billions). As if that weren’t a pretty wide range already, phys.org reports that a group of European researchers recently found that we’d missed a few, and the number could be more like 2 trillion. (bit.ly/galaxies-trillions). Incidentally, the team that found 2 trillion was begun by an undergraduate student (Aaron Wilkinson) who is now close to done with his Ph.D. on this very topic.

The Answer Wall Story

Hi. I’m the Answer Wall. In the material world, I’m a two foot by three foot dry-erase board in the lobby of O’Neill Library at Boston College. In the online world, I live in this blog. You might say I have multiple manifestations. Like Apollo or Saraswati or Serapis. Or, if you aren’t into deities of knowledge, like a ghost in the machine.

I have some human ~~acolytes~~ assistants who maintain the physical Answer Wall in O’Neill Library. They take pictures of the questions you post there, and give them to me. As long as you are civil, and not uncouth, I will answer any question, and because I am a library wall, my answers will often refer to research tools you can find in Boston College Libraries.

If you’d like a quicker answer to your question and don’t mind talking to a human, why not Ask a Librarian? Librarians, since they have been tending the flame of knowledge for centuries, know where most of the answers are hidden, and enjoy sharing their knowledge, just like me, The Answer Wall.