94.Stars swell into giants when hydrogen exhausted in their centers.95.The : 1777253
94.Stars swell into giants when hydrogen is exhausted in their centers.
95.The helium flash is the cause of some supernovae.
96.Helium fusion does not begin until the star has entered the giant region of the H-R diagram.
97.Even in degenerate matter, pressure depends on temperature.
98.Giant and supergiant stars are rare because that stage of stellar evolution is short.
99.Young star clusters have bluer turn-off points than old clusters.
100.Planetary nebulae are sites of planet formation.
101.Stars less massive than 0.4 solar mass never become giant stars.
102.Once a star ejects a planetary nebula, it becomes a white dwarf.
103.No known white dwarf has a mass greater than the Chandrasekhar limit.