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Black hole has no hair

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alokmohan

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This is famous quote of John Archibold Wheeler.He named black hole in 1972.Before that bh we called frozen stars.A star may have features say mountain.After it becomes black hole it is a smooth sphere with no traces of any feature.It sonds sexy,Wheeler did not bother.
 
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weeman

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It was certainly believed that all of the celestial bodies in the sky were perfect, featureless spheres. That is until Galileo built his telescope and witnessed the first sunspots, as well as craters on the moon. This of course meant that the heavens were not as perfect as people had thought they were. Of course, Galileo also cataloged Jupiter's moons orbiting the massive planet, helping to debunk the theory of a geocentric universe.<br /><br />Anyways, listen to me, I'm rambling! Hmmm, might blackholes be featureless? Of course, we might have to sit down and come up with every possible thing that can be classified as a feature <img src="/images/icons/smile.gif" /> If the idea of a singularity is true, then how can such an infinitely small object have any type of feature? Or, it is possible that we can refer to a blackhole being featureless if we are talking about the event horizon.<br /><br />If the event horizon is a mathematical boundry, then mathematics would make it a perfect sphere. And since the event horizon is the last thing we can see, I think we can conclude that blackholes are indeed featureless <img src="/images/icons/smile.gif" /> <br /><br />There, I figured it out! <div class="Discussion_UserSignature"> <p> </p><p><strong><font color="#ff0000">Techies: We do it in the dark. </font></strong></p><p><font color="#0000ff"><strong>"Put your hand on a stove for a minute and it seems like an hour. Sit with that special girl for an hour and it seems like a minute. That's relativity.</strong><strong>" -Albert Einstein </strong></font></p> </div>
 
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alokmohan

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Event hole is the last thing you see.Below it you canot see.That is why we add horizon term. Event hole is the place where escape speed is speed of light.
 
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alokmohan

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Only three properties of black hole,mass,spin,charge.They are simple beasts.
 
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