Bottom image: HL Tauri, as imaged by ALMA. Top image: Conversion to rectangular coordinates. Band radii and ratios calculated for adjacent bands. Bands n=1,2,3,5 exhibit probably dynamic resonances, per R.W. Bass and A. Del Popolo, "Dynamical Derivation of Bode's Law" International Journal of Modern Physics D, 01/2005; 14(01):153-169. DOI: 10.1142/S0218271805006195 Source: arXiv