This story appears in the November 2013 issue of National Geographic magazine ... To this day we have better maps of Venus, Mars, and the far side of the moon than we do of much of underwater ...

sketch maps in his notebook, and knowingly label distant strata from their colors and continuities. Similarly, thanks to reports from the six-wheeled rovers exploring two small patches of Mars ...

This story appears in the November 2016 issue of National Geographic magazine. In winter the temperature at the poles of Mars can reach 200° below zero Fahrenheit. But make no mistake ...

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 ...