2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6619The reason, we need three terms of `strange', `bare', and `solid' before quark stars, is presented concisely though some fundamental issues are not certain. Observations favoring these stars are introduced.4 page and no figure, IAU Symposium No.218, or at http://vega.bac.pku.edu.cn/~rxxu/publications/index_C.htmAstrophysicsHigh Energy Physics - Phenomenologytext