You can now watch the "Stranger Things" Season 5 finale, a movie called "Rightside Up.'' A UD professor reflects on series' ...

Mars has never looked more like a planet built for hiding secrets. A cluster of eight vast, water-carved caves appears almost engineered to shield fragile chemistry, or even biology, from the brutal ...

Hints of ancient microbes in Martian rocks and a revived theory about our cosmic ancestry are forcing scientists to rethink ...

Resolve to read more books in 2026—and start right here with io9’s first list of the year rounding up all the new sci-fi, ...