The imaginary constructions of science fiction fill us with awe at their alien vastness. Which have you explored, and what was the most overwhelming?

During excavations near Stăuceni in the Botoșani district in northeast Romania, archaeologists from FAU discovered a megastructure built by the Cucuteni-Trypillia culture. Covering approximately 350 ...

Our search for technosignatures—clear signs of advanced civilizations beyond Earth—takes many forms. Many are driven by the famous Drake equation, which attempts to estimate how many technological ...

In 1960, Freeman Dyson proposed how advanced civilizations could create megastructures that enclosed their system, allowing them to harness all of their star's energy and multiplying the habitable ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. It might be evidence of aliens building gigantic structures around ...

The inexplicable dimming periods of a star in the Milky Way have some shouting "aliens." European scientists say they know better. For half a decade now, a telescope in NASA's Kepler spacecraft has ...

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 ...

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 ...