  We present a model for the triggering of Supernovae Ia (SN Ia) by a phase
transition to exact supersymmetry (susy) in the core of a white dwarf star. The
model, which accomodates the data on SN Ia and avoids the problems of the
standard astrophysical accretion based picture, is based on string landscape
ideas and assumes that the decay of the false broken susy vacuum is enhanced at
high density. In a slowly expanding susy bubble, the conversion of pairs of
fermions to pairs of degenerate scalars releases a significant amount of energy
which induces fusion in the surrounding normal matter shell. After cooling, the
absence of degeneracy pressure causes the susy bubble to collapse to a black
hole of about 0.1 solar mass or to some other stable susy object.
