Degenerate Pressure Can End Fusion
	• Degenerate Electron Pressure limits contraction and core temperature – “Stars” with M < 0.08 MSun never burn H    (brown dwarfs) – Stars    with M < 0.4   MSun never burn He   (red dwarfs) – Stars    with M < 4      MSun never burn C     (but do make red giants) – Stars    with M > 4      MSun do burn elements all the way to Fe • What happens to these objects? – Brown dwarfs never become bright – sort of giant version of Jupiter – Red dwarfs have such long lives none have yet exhausted H – Red giants are related to white dwarfs – Massive stars explode as supernova