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Why a mass transfer in a binary star system, from the less dense star to the denser star forms an accretion disk? Why the material does not fall directly to the denserstar?

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  • $\begingroup$ Welcome to Astronomy SE! Although the question is a valid and interesting one, I would appreciate a bit more information, in particular on the background of your question (why you are asking) and what you know so far. In dubito pro reo, I just assume that it is not an exam question. For more guidance see How to Ask. $\endgroup$
    – B--rian
    May 21 at 7:29
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    $\begingroup$ Because it is hard to get rid of angular momentum in space.. (i.e. youtube.com/watch?v=LHvR1fRTW8g "Why hitting the sun is hard") $\endgroup$ May 21 at 9:40
  • $\begingroup$ an accretion disk can form if the mass transfer is dynamically stable $\endgroup$ May 21 at 22:45

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