This story appears in the August 2017 issue of National Geographic magazine. Carl Sagan spent his childhood immersed in Mars. The future scientist, an avid reader of Edgar Rice Burroughs’s ...

In an article of his that was published in early 1975 entitled “In Praise Of Robots” by Carl Sagan, Natural History ... Concentrate on the aspects of your life that you have control over.

SAGAN: I personally have been captured by the notion of extraterrestrial life, and especially extraterrestrial intelligence from childhood. It swept me up, and I've been involved in sending space ...

The Carl Sagan Center for Research (CSC ... across nearly all branches of science addressing researching questions around the development of life, where else in the universe it exists and how we might ...

In the early life of the Sun ... is 10 years); 4.0 to 4.5 aeons ago global temperatures were about 2,63OK," Carl Sagan and George Mullen wrote, turning their attention to the topic in 1972.

In the early life of the Sun, when the Earth was newly ... Earth had abundant water flowing 3.2 aeons ago. As well as this, Sagan and Mullen point out, we have algae fossils dating back to around ...