# Can a “gravity assist” at a black hole accelerate light faster than the speed of light? [closed]

With the help of a gravity assist from a black hole, can light travel faster than its natural light speed??

Satellites use gravity assistance. In a similar way can light traveling near black hole accelerate as well?

## closed as unclear what you're asking by peterh, GremlinWranger, Jan Doggen, Michael Seifert, Brian Tompsett - 汤莱恩Jul 12 at 19:24

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• When speaking of speed, you should provide a frame of reference. For probes, the frame of reference in which speed is increased is heliocentric. I suggest you read this xkcd - what if (Stop Jupiter) – Manu H Jul 12 at 8:00
• Light cannot move faster than "light speed". The speed of light in vacuum is a hard limit and no matter what you do, nothing can move faster. Not even light itself. – DarkDust Jul 12 at 9:05
• I don't think you can get any answer besides "no" using science. The speed of light is assumed to be constant in all workable theories of black holes and general relativity. – uhoh Jul 12 at 9:10
• Hey people, this is not unclear what you're asking! It's off-topic perhaps (rather belongs to physics.SE), but since a gravity assist is a perfectly well-known maneuver it's clear how it would naïvely generalise to “accelerating light”. – leftaroundabout Jul 12 at 15:42
• I'm voting to close this question as off-topic because it probably belongs on Physics instead. – Michael Seifert Jul 12 at 17:35

No, nothing can move faster than the speed of light in a vacuum. There are no tricks around it (that we know of), for example if you fly around with speed v in a spaceship and mount a lamp at the front, the speed of the light will not be v+c. It will still be c. That is actually why time passes at a different speed on fast-moving objects such as spaceships.