‘Giant alien megastructure found in space’: What is a Dyson sphere, and what else could we have found?

Scientists have spotted strange changes in light deep in space — which some claim might be a huge alien power station.

The huge cluster of objects has been said by scientists to be so strange that they have very little idea what it is. And some have speculated that it could be a swarm of megastructures built by aliens, while others say it might be one of the biggest clouds of space dust ever seen.

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