From gravity-defying cities to sky-high pyramids, explore the world’s most ambitious megastructures that were never built.

The world was electrified last year when it was suggested that scientists had spotted an “alien megastructure” orbiting a distant star. Now a space boffin has suggested huge extraterrestrial ...

Dive into the depths of our planet as we explore the astonishing megastructures hidden within Earth. What secrets do they hold, and why is no one discussing these incredible discoveries? Join us on ...

Dyson sphere stability — once considered an impossible physics problem — may be within reach. A peer-reviewed paper in ...

A story that went viral this week reports that astronomers finally found E.T., but those aren't the facts. CNET's Eric Mack talks with the astronomers involved about what is still a very interesting ...

A European Space Agency catalog of the Milky Way's billions of stars could be hiding evidence of highly advanced alien civilizations with serious building skills. Eric Mack has been a CNET contributor ...

Throughout the 1960s and ’70s, starry-eyed architects set their minds to megastructures – massive, multi-purpose designs that could house communities or even entire cities. Complex and expensive to ...