  Some problems in nuclear astrophysics are discussed with emphasize on the
ones central to the field which were not solved over the last two decades,
including Helium Burning in Massive stars (the 12C(a,g)16O reaction) and the 8B
Solar Neutrino Flux Problem (the 7Be(p,g)8B reaction). We demonstrate that a
great deal of progress was achieved by measuring the time reverse process(es):
the beta-delayed alpha-particle emission of 16N and the Coulomb dissociation of
8B, using radioactive beams (of 16N and 8B). In this way an amplification of
the sought for cross section was achieved, allowing a measurement of the small
cross section(s) of relevance for stellar (solar) process(es).
