Astronomers propose finding alien civilizations by searching for unusually cold stars that could be surrounded by Dyson swarms—energy-harvesting structures first proposed by Freeman Dyson.

This scene imagines the mysterious beauty of alien worlds beyond our solar system. The landscape features unusual plant life, towering organic structures, and glowing vegetation surrounding calm water ...

As Nicolas Roeg’s enigmatic, unclassifiable film – in which David Bowie plays an alien visiting Earth – turns 50, we look back at Tom Milne’s deciphering of it. From our Summer 1976 issue.