Could you see a nuclear explosion on the moon with the naked eye? That was the question posed by the United States military in the 1950s as the cold war was heating up and the space ra ...

The multi-faceted band's new tune " Try Not to Die " played a few songs into the set, poetically employing Carl Sagan's ...

Mixed Signals,” by Rebecca Charbonneau, explores an unusual period of Soviet-U.S. cooperation in the hunt for aliens.

Carl Sagan had a bone-chilling prediction about America in 1995. A passage from his book, The Demon-Haunted World, is now trending online a day after Donald Trump’s presidential inauguration.

The famed astrophysicist Carl Sagan and former President Jimmy Carter shared a fundamental understanding about the fragility of our planet and the futility of our wars in a “vast and awesome ...

But for billions of years before that, our planet’s oceans were not blue at all. Instead, they were a striking shade of green ...

Mercury has a rocky surface when, facing the sun, can reach highs of 800 degrees while overnight lows could reach minus 290 degrees, according to the space agency. Venus holds the crown of the hottest ...

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 ...