A forgotten science-fiction miniseries from 2015 adapted one of Arthur C. Clarke's very best books in just three episodes.

Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.

Looking up reveals nature’s skylight, framing Arizona blue against fiery red stone in perfect composition. Photo credit: ...

Stacker compiled a ranking of cities with the most UFO sightings in Texas using data from the National UFO Reporting Center.

July has arrived with explosions of fireworks and celebrations of the 250th anniversary of our country. For those who aren’t ...

Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals . Unexplained gases on other planets. Things mistaken for UFOs ...

With new technologies come new opportunities. And that is especially true in astronomy—with every new advanced telescope, we ...

In Trump's alternate reality, the greatest American soccer story of this summer never happens, writes the editorial board.

Stacker compiled a ranking of cities with the most UFO sightings in North Dakota using data from the National UFO Reporting ...