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They were also looking for Spaceship Engines :

"if the matter occluding the star is actually due to extensive megastructures, then microwave-driven spacecraft to service these structures could inadvertently be revealed by a powerful, wide bandwidth signal. "

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Isn't this a little like an 1700's scientist looking for a horse and buggy at 35,000 feet instead of a 787? If a civilization is advanced enough to construct these massive structures or vehicles we have no clue what propulsion or power source might be their current technology.

Agreed. For all we know, they have telekinesis-propelled spacecraft that literally fly on the power of the pilot's mind.

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