Most people know the theory that an asteroid smashed into Earth — hitting what is now the Yucatán Peninsula — and killed off ...

Supernovas are powerful explosions marking the death of massive stars. They spread elements like carbon, calcium, and iron ...

Carl Sagan, the astronomer ... Suppose point B was in orbit around some bright star. The moment you were in the wormhole, near your point of origin A, you would see that star.

Carl Sagan told us that there are more stars in the universe than there are grains of sand on all of the Earth's beaches. At the same time, there are more H 2 O molecules in just 10 drops of water ...

With the occasional nod to his greatest achievements, his exploration of the cosmos is at times a challenging, daunting ...

Astronomer and astrophysicist Frank Drake designed the map, working with fellow astronomer Carl Sagan and artist and ... rapidly spinning remains of dying stars—the leftover cores of supernova ...