cases there are bosonic baryons. Does it occur in a world without light quarks? In another direction: How far is our world from a (literally) strange world, in which the ground state for baryonic matter has nonzero strangeness? How much lighter would the strange quark have to be?

### Reinvent Extreme Astrophysics

There is a chance to break new ground, and to advance our understanding of some of the most violent and crucial events in cosmic evolution, by getting a better handle on the behavior of hadronic matter in extreme conditions. Contemporary astrophysical modeling of supernova explosions and of the structure and evolution of compact stars is largely based on poorly controlled extrapolations of models abstracted from nuclear and resonance physics well beyond their region of validity, into regimes where the particles are strongly interacting or even overlapping. In other words, it is sophisticated guesswork. We have good asymptotic theories based on QCD for the highest temperatures and densities, but there is much uncertainty about where and how asymptopia is approached. We may look forward to a wealth of relevant new data from x-ray, neutrino, and gravitational wave detectors, in addition to dramatic enhancements of the traditional optical and radio 