  Astrophysics and planetary science are in crisis. The large missions we need
for the next generation of observations cost too much to let us do more than
one at a time. This spreads the science out onto a generational timescale,
inhibiting progress in both fields. There are two escape paths. In the long
run, but still well within our planning horizon, commercial space will bring
mission costs down substantially allowing parallel missions at multiple
wavelengths or to multiple destinations. In the short run, adopting prudent
principles for designing a research program will let us maintain vitality in
the field by retaining breadth at a modest cost in depth.
