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Black Hole's Spin Revealed for 1st Time
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<blockquote data-quote="Umbran" data-source="post: 6094529" data-attributes="member: 177"><p>The singularity, by relativistic definition, has no volume, correct. And the Event horizon is not made of matter, or anything like that. However, there is still spin.</p><p></p><p>There are a few things in this Universe that cannot be created or destroyed, and may only be transformed. Energy is one of them. Momentum is another. When we say that something is spinning, that means it has some rotational kinetic energy, some angular momentum. When a star or other mass collapses into a black hole, that energy and momentum have to go *somewhere*. Either the mass has to shed it into the universe before it collapses, or it keeps it after collapse. If it keeps it, well, then whatever the volume of the singularity, it sill has to be spinning, by virtue of the fact that stopping isn't an option.</p></blockquote><p></p>
[QUOTE="Umbran, post: 6094529, member: 177"] The singularity, by relativistic definition, has no volume, correct. And the Event horizon is not made of matter, or anything like that. However, there is still spin. There are a few things in this Universe that cannot be created or destroyed, and may only be transformed. Energy is one of them. Momentum is another. When we say that something is spinning, that means it has some rotational kinetic energy, some angular momentum. When a star or other mass collapses into a black hole, that energy and momentum have to go *somewhere*. Either the mass has to shed it into the universe before it collapses, or it keeps it after collapse. If it keeps it, well, then whatever the volume of the singularity, it sill has to be spinning, by virtue of the fact that stopping isn't an option. [/QUOTE]
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