63.Some young star clusters contain large numbers of T Tauri : 1777242
63.Some young star clusters contain large numbers of T Tauri stars.
64.Ninety percent of all stars fuse helium to form carbon and lie on the main sequence.
65.Nuclear fusion in stars is controlled by the dependence of density on mass.
66.The sun has a core in which energy travels outward primarily by radiation.
67.The sun makes most of its energy by the CNO cycle.
68.Energy flows by radiation or convection inside stars but almost never by conduction.
69.Hydrostatic equilibrium refers to the balance between weight and pressure.
70.The Orion region contains young main sequence stars and an emission nebula, but the original molecular cloud they formed out of has been dispersed.
71.T Tauri stars are believed to be young, high mass main sequence stars.
72.The dust in the interstellar medium can make distant stars look redder than they really are.