new scientist July 15, 2017 current issue has article on boson stars, objects with the size and mass of stars, but composed of bosons. boson stars could mimic black holes. that got me thinking. if you had glueballs gravitational bound and the size and mass of a neutron star - or even larger - would it be stable as neutron stars are stable? what would a star composed solely of gluons theoretical properties be? could a boson star composed solely of gluons mimic a black hole?