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Simple question: can we prove that what we call today a "star" is not a accretion disk of a "tiny" black hole that happens to rotate in all the 3 axis?

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    $\begingroup$ An object can't rotate in all three axes because that wouldn't conserve angular momentum. A black hole + accretion disk must have axial symmetry not spherical symmetry. Accretion disks have a competely different spectrum to stars. In particular they radiate lots of X-rays. Bearing in mind how closely we've observed our own star it can't possibly be a black hole + accretion disk. $\endgroup$ – John Rennie May 13 '15 at 17:45
  • $\begingroup$ Related: physics.stackexchange.com/q/26083/2451 , physics.stackexchange.com/q/93830/2451 and links therein. $\endgroup$ – Qmechanic May 13 '15 at 18:48
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    $\begingroup$ Also, the Doppler profile will be much more pronounced for an accretion disk, as opposed to a star, due to the much higher speeds. $\endgroup$ – Paul May 13 '15 at 19:12

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