  Chandra observations toward the nearby molecular cloud MBM12 show
unexpectedly strong and nearly equal foreground O VIII and O VII emission. As
the observed portion of MBM12 is optically thick at these energies, the
emission lines must be formed nearby, coming either from the Local Bubble (LB)
or charge exchange with ions from the Sun. Equilibrium models for the LB
predict stronger O VII than O VIII, so these results suggest that the LB is far
from equilibrium or a substantial portion of O VIII is from another source,
such as charge exchange within the Solar system. Despite the likely
contamination, we can combine our results with other EUV and X-ray observations
to reject LB models which posit a cool recombining plasma as the source of LB
X-rays.
