ESTIMABLE:

A． A lack of electromagnetic energy prevents the GHBs from becoming visible at the earliest stage of their existence.
B． Photon density precludes the manifestation of GHBs to observers as the GHBs initially develop.
C． There is a dearth of luminosity that makes GHBs impossible to observe from longer distances, but not shorter ones.
D． The viewer's timescale tends to be to compressed at the earliest phase of GHBs' development to allow them to be observed.
E． GHBs tend to move at too slow a velocity to be observed as the initially develop.

A． establishing and arguing for the implementation of social practices more affirmative than those found in Invisible Man
B． eschewing the obligations that praise of Ellison's work entailed for him, and thereby working to subvert the literary system
C． supporting a vision of "exceptional" America in contrast to Ellison's "unexceptional" version, and broadening the scope of that vision
D． putting the same theories of reform Ellison espoused in his book into concrete practice through activism
E． exposing the more effective critique of traditional American values advanced by Ellison's literary precursors