  Recently acquired evidence shows that extrasolar asteroids exhibit over a
factor of 100 variation in the iron to aluminum abundance ratio. This large
range likely is a consequence of igneous differentiation that resulted from
heating produced by radioactive decay of 26Al with an abundance comparable to
that in the solar system's protoplanetary disk at birth. If so, the
conventional view that our solar system began with an unusually high amount of
26Al should be discarded.
