Add Yahoo as a preferred source to see more of our stories on Google. What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist ...

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Scientists have identified new clues that could help astronomers spot one of the most famous hypothetical alien ...

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 ...

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A recent study reveals that certain configurations of artificial spheres and rings around binary stars could be stable. The work of Colin McInnes, published in the Monthly Notices of the Royal ...

If there really are advanced alien civilizations out there, you'd think they'd be easy to find. A truly powerful alien race would stride like gods among the cosmos, creating star-sized or galaxy-sized ...

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 ...