Black Laser
Posted on Tuesday, July 6th, 2010 at 9:36 pmBlack Laser
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If we pointed a laser at a black hole?
Say we were able to travel close enough to a black hole without getting sucked in, and pointed a powerful laser at it. How close would the laser beam get before it dissappeared? Would it slowly fade or just suddenly vanish at a certain point?
From your perspective, the laser would NEVER disappear.
There is a distance from the black hole called the "event horizon" and once an object enters that, no information from the object can leave. However, while the object does enter the event horizon in reality, it does not appear so from an external observer. You would think that the laser is getting closer and closer to the event horizon and as it does so, it loses energy due to gravity of the black hole, causing its frequency to drop and wavelength to rise, making it appear redder and redder, and finally it enters infrared (beyond our visible range of light) and beyond that too, but these infrared signals continue reaching us forever, though we cannot see them with the naked eye. We can still detect these signals, and they get dimmer and dimmer and therefore harder to detect, but if we had the technology to detect infinitesimally small frequencies of light, we could ALWAYS detect this laser.
This happens due to einstein's relativity. The laser enters the event horizon from its own perspective, but from our perspective, it gets closer and closer to the event horizon but never enters, and signals from the laser get dimmer and harder to detect, but never quite become completely undetectable physically.
