19 June 2012 UTC Protoplanetary and a bit more advanced with some young planets see exoplanet hunting There s only a few I ve read about from somewhat advanced systems but there s the promise of finding more with the new IR scopes and from more advanced discs The K cliff seems to make a fairly clear boundary of the Sun s evolved accretion disc Anyway that s just one potential number for the box Without several more added to the above I don t think the infobox is desirable What other properties are there Which do we have actual measurements for And which aren t just a property of the sun alone 16 40