The observable universe is 93 billion light-years across. So far, no human has ventured farther than 1.3 light-seconds from Earth. http://pic.twitter.com/szZTAuzMQp — Brian Greene (@bgreene) December 5, 2017 By Lee| 2017-12-06T12:07:45+00:00 December 6th, 2017|@leepottsofs, Tweet|0 Comments Share This Story, Choose Your Platform! FacebookTwitterLinkedinRedditTumblrGoogle+PinterestVkEmail About the Author: Lee Related Posts Leave A Comment Cancel reply Comment Notify me of follow-up comments by email. Notify me of new posts by email.