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Re: Streams Of Hot Gas Twice The Speed Of Light

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Posted by Marlock/">Marlock on December 13, 1997 21:08:09 UTC

: : : : : : This sounds bogus. Do you have the article in question? I would be interested in seeing it myself.

: : : : : My elementary students wondered about some new findings posted by : : : : : Reuters where ultra hot gas was escaping from a black hole : : : : : at around twice the speed of light. They wondered: : : : : : 1. How ANYTHING can escape from a black hole : : : : : 2. How AnYTHING can go above the speed of light. : : : : : Any answers would be appreciated to explain these : : : : : phenomenon. : : : : Sorry to add that we don't have a good browser, : : : : so please reply via e-mail. Thanks!

: : : : It is not bogus. The article says, relative speed of : : two streams is close to that of twice speed of light. : : Each stream is travelling with velocity of light in : : opposite direction.

: Ok. The gas that is being shot out is coming from the : matter that is falling in. As matter spirals towards the : black hole it is heated and ionized. This creates a super : magnetic field and some of the matter can be shot out the : poles. Not matter that crosses the event horizon mind you. : Just matter that came very close to being sucked in.

: As for the twice the speed of light comment. The : author makes the mistake that if two objects are travelling : near the the speed of light and are travelling in : opposite directions, then they are separating at twice the : speed of light from each other. While this is true : at low velocities, this is not the case when you : approach the speed of light. The apparent separtion : velocity of the two jets at opposites sides of the : black hole is still constrained by the speed of light.

The article says at 90% of the speed of light, not 90% above the speed of light. but my question is: if even light cannot escape a black hole, then how could gases with more mass, travelling slower escape?

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