  Normal baryonic matter inside an evolved massive star can be intensely
compressed by gravity after a supernova. General relativity predicts formation
of a black hole if the core material is compressed into a singularity, but the
real state of such compressed baryonic matter (CBM) before an event horizon of
black hole appears is not yet well understood because of the non-perturbative
nature of the fundamental strong interaction. Certainly, the rump left behind
after a supernova explosion could manifest as a pulsar if its mass is less than
the unknown maximum mass, $M_{\rm max}$. It is conjectured that pulsar-like
compact stars are made of strange matter (i.e., with 3-flavour symmetry), where
quarks are still localized as in the case of nuclear matter. In principle,
different manifestations of pulsar-like objects could be explained in the
regime of this conjecture. Besides compact stars, strange matter could also be
manifested in the form of cosmic rays and even dark matter.
