In a paper titled Fast Radio Bursts from Extragalactic Light Sails, researchers at the Harvard-Smithsonian Center for Astrophysics (CfA) are theorising that FRBs may not be a natural phenomena and are, instead, an immense alien power plant used to propel large alien starships using light sails. The researchers noted that while the existence of an alien propulsion system of such magnitude would be feasible because of the laws of physics, their work is entirely speculative.
It's possible that a more advanced alien species uses photonic propulsion to power much larger spaceships. Loeb and fellow Harvard researcher Manasvi Lingam found that if an object twice the size of the Earth were harnessing solar power and converting the energy into a laser beam to propel spacecraft, then the radio emissions from it would be detectable even across billions of light-years. Such a planet-sized power system would be capable of accelerating a spaceship weighing a million tons, which is about 20 times bigger than the biggest cruise ships.
"That's big enough to carry living passengers across interstellar or even intergalactic distances," says Lingam.
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