  Electron diffraction, imaging, and energy loss provide evidence for unlayered
graphene sheets in the core of certain interstellar graphite onions (from the
meteorite Murchison) whose isotopes indicate formation in the atmosphere of
late-stage asymptotic giant branch stars (like those which nucleo-synthesized
much of the earth's carbon). The data are compared to structural models loosely
associated with atom-by-atom, molecule-by-molecule, and dendritic-droplet
solidification processes. In this context the observed density, diffraction
peak-shapes, and edge-on sheet patterns, along with theoretical limits on time
for growth in the presence of outgoing radiation pressure, suggest nucleation
of hexagonal sheets from pentagons, perhaps from a supercooled melt. These
results warrant a closer examination of specimen structure, the energetics of
unlayered graphene nucleation, and processes such as jets in late star
atmospheres.
