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Aliens might zap black holes with lasers to travel the galaxy

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/ Supply: Reside Science

Via Rafi Letzter, Reside Science

An astronomer at Columbia College has a brand new wager about how hypothetical alien civilizations may well be invisibly navigating our galaxy: Firing lasers at binary black holes (dual black holes that orbit each and every different).

The theory is a futuristic improve of a method NASA has used for many years.

Spacecraft already navigate our sun gadget the usage of gravity wells as slingshots. The spacecraft itself enters orbit round a planet, flings itself as shut as imaginable to a planet or moon to pick out up pace, after which makes use of that added power to go back and forth even sooner towards its subsequent vacation spot. In doing so, it saps away a tiny fraction of the planet’s momentum thru area — regardless that the impact is so minimum it is just about not possible to note. [9 Strange, Scientific Reasons We Haven’t Found Aliens Yet]

The similar elementary ideas perform within the the serious gravity wells round black holes, which bend no longer most effective the trails of cast gadgets, however mild itself. If a photon, or a gentle particle, enters a selected area within the neighborhood of a black hollow, it is going to do one partial circuit across the black hollow and get flung again in precisely the similar route. Physicists name the ones areas “gravitational mirrors” and the photons they fling again “boomerang photons.”


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