  We discuss the first-order phase transition of QCD at high temperature in the
universe and the possible formation of quark-matter lumps through cooling in
regions of increased pressure. We show tha similarity of results using
confinement and breaking of chiral symmetry. The inclusion of strange matter
may give stability to small drops, or strangelets, in the colour-flavour locked
phase possibly achieved in neutron stars that could reach a high-altitude
observatory like that of Chacaltaya as primary cosmic rays.
