ASTR 311 Study Guide - Midterm Guide: Emission Nebula, Planetary Nebula, Crab Nebula
Document Summary
If the mass of a body were doubled, its gravity would become 4x stronger: false ( should only double, f=ma) Luminosity and surface temperature: star a is a main sequence star of spectral type g5 and star b is a red giant of spectral type k2. A trillion years: on the h-r diagram, red supergaints like betelguese lie at the top right, about how many stars has hipparcos given us accurate distance data on: a million, those with parallaxes of. They can be penetrated only with longer wavelengths such as radio and infrared: astronomers use roman numerals to indicate the ionizaion state of a gas. Hii: the temperature inside an hii region is colder than insider an hi region. A beam of light projected by the ship would be measured by this observer to travel at c: eventually, all low mass stars will become white, then black, dwarfs.
