Dyson spheres, the hypothetical mega-structures that advanced alien civilizations might use to enclose a star and harness its energy, suffer from a fatal flaw: They are catastrophically unstable. But ...

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 ...

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 ...

We may receive a commission on purchases made from links. All of our planet's energy — whether it's gained from food, fossil fuels, or renewable sources — ultimately comes from the sun. Solar ...

In 1960, visionary physicist Freeman Dyson proposed that an advanced alien civilization would someday quit fooling around with kindergarten-level stuff like wind turbines and nuclear reactors and ...

Back in the 1800s, in the halcyon days of evidence-free speculation on life in the universe, the Scottish “natural theologist” Thomas Dick famously proposed that our solar system could harbor about 22 ...