Citations:protosun


 * 2004, Robert Hutchison, Meteorites: A Petrologic, Chemical and Isotopic Synthesis, Cambridge University Press (2006), ISBN 0521470102 (hardback), ISBN 0521035392 (paperback), chapter 7.2, :
 * Only one major cycle of activity of a T Tauri protosun seems to have affected the chondrite groups, otherwise refractory enriched solids would have acquired progressively lower temperature fractions during inward passage in the accretion disk. This infers that the precursors of the chondrite groups formed in <104 years, the time calculated for a CAI-sized particle to reach the protosun from an asteroidal distance. Such a short time constrains theories of planetary origins (chapter 12).