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" ... Meanwhile, gravitational collapse causes the central protostar to heat up. ... "
" ... The protostar IM Lup has a protoplanetary disk around it that exhibits not only rings, but a spiral... [+] feature towards the center. There is likely a very massive planet causing these spiral features, but that has yet to be definitively confirmed. In the early stages of a solar system's formation, these protoplanetary disks cause dynamical friction, causing young planets to spiral inwards rather than complete perfect, closed ellipses. ... "
" ... “A second possibility is that the magnetic field of the protostar is in a different plane from the rotational plane of the disk, and that the inner disk is being pulled into a different plane from the rest of the disk by the magnetic field.” ... "