100 years ago this week, Edwin Hubble proved that our galaxy is just one small island in a vast cosmic sea. It is absolutely wild to consider how we've only know about other galaxies for a hundred years. What a golden age of learning about our universe this century has been - but I can't help but wonder what is yet to be discovered.

Read more about Hubble’s discovery in Corey S. Powell’s essay on the anniversary: “The 100th Birthday of the Universe”