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"It is proposed that such a slingshot can be performed remotely using a beam of light which follows a boomerang null geodesic.
"Using a moving black hole as a gravitational mirror, kinetic energy from the black hole is transferred to the beam of light as a blueshift and, upon return, the recycled photons not only accelerate but also add energy to the spacecraft.”
System - Kipping
This system, which Kipping termed the...
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