  Three topics with relation to color superconductivity in strange quark matter
are discussed. 1) The r-mode instability in strange stars, which is consistent
with the existence of ``ordinary'' strange quark matter stars but inconsistent
with strange stars in a pure color-flavor locked state. 2) Color-flavor locked
strangelets, which are more bound than normal strangelets, and have a different
charge-mass relation. 3) Estimates of the strangelet flux in cosmic rays, which
is relevant for strangelet detections in upcoming cosmic ray space experiments.
