The DeLorean from Back to the Future is still the most iconic time travel vehicle, both in terms of style and narrative.

Does NASA have files on aliens? Jared Isaacman says no, and tells Ross Douthat on “Interesting Times” that extraterrestrials would pick a more exciting locale to visit than America’s naval bases.

Although astronomers have found thousands of exoplanets, the number of confirmed exomoons—and exorings—is still zero. But ...

In shaking up its Artemis lunar program, NASA's new moon plan looks more like the Apollo missions of the 1960s. Instead of ...