Often referred to as the "astronomer of the people," Carl Sagan was one of the most popular scientists in American culture for decades. Friday marked what would have been Sagan's 84 birthday.

Carl Sagan, the beloved American astronomer ... Twitter users are sharing some of Sagan's most insightful and inspiring quotes online.

Etsy user halfpencedesign framed this iconic Sagan quote in a customizable poster ... the farthest of any human probe. Carl's thirst for exploration is highlighted in this poster ($24) by Etsy ...

His quotes and insights are all over the internet, but here’s why you should really care about Carl Sagan. Today, 9 November 2015, a chorus of voices on this pale blue dot we call Earth are ...

Warner Bros. has announced that it’s developing a biopic based on the life of astrophysicist Carl Sagan, sending physics fans into leaps of joy, and tired writers into the depths of their minds ...