In 1967, astronomers thought they had finally heard from the neighbors. They intercepted a signal so regular and precise it seemed impossible for it to be natural. But the excitement didn’t last.

Observations of the two solar system gas giants have revealed that Jupiter 's north pole hosts a central polar vortex ...

Though he hasn’t been back in years, there are images seared in Julian Glander’s memory. “I thought it was the most beautiful ...