s appropriate or necessary to
'move along' the hierarchy in attempting to characterize winters; Etc.

<P><U>A hierarchy of stars</U>? Certain stars generate chemical elements
and isotopes that are then recycled in other stars and without which those
other types and generations of stars are impossible; Similar stellar hierarchy
may exist thanks to the production, recycling, multistage transformation,
or control of different molecular species by generations--or perhaps by
synchronic hierarchies--of stars; Hie