To observe a visual binary, we must measure radial velocities. To observe a spectroscopic binary, we must be able to see both stars individually. The most massive main-sequence stars are the M stars. The neutrino process 35. Neutrino is a subatomic particle produced in nuclear fusion that can travel through the sun and escape to space without interacting with any particles in the sun.
Opacity is the resistance of a gas to the flow or radiation.
Ninety percent of all stars fuse helium to form carbon and lie on the main sequence. Giant and supergiant stars are rare because that stage of stellar evolution is short. Stars less massive than 0.4 solar mass never become giant stars. C. luminosity and flux. D. luminosity and mass.