Today, 9 November 2015, a chorus of voices on this pale blue dot we call Earth are paying homage to the late, renowned American scientist, Carl Sagan. It would have been his 81st birthday.
Much of the praise heaped on the famous communicator and author is being shared in the form of his own words, as internet memes. We collected a few of our own favourite quotes – see the images below. (Which Sagan quote do you like best? Let us know on our social media pages at the links below.)