Elon Musk has once again turned his attention skyward — this time with an audacious idea that blurs the line between space engineering and climate intervention. In a post shared on X (formerly Twitter ...

There are three ways to look for evidence of alien technological civilizations. One is to look out for deliberate attempts by them to communicate their existence, for example, through radio broadcasts ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. What would be the ...

Dyson spheres, theoretical megastructures proposed by physicist Freeman Dyson in 1960, were hypothesised to be constructed by advanced civilisations to harvest the energy of host stars. It’s thought ...

Simon Goodwin does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...