The diagrams show brightness - spectral type diagrams for 2 open clusters. Answer in parsecs. Astronomers of the 18th and 19th centuries thought that the Sun was near the center of the Milky Way galaxy since they counted the same number of stars in the disk of the Galaxy in every direction. Show all work. Describe how a white dwarf is produced from a red giant.
White dwarfs are the commonest stars in the Galaxy.
Not one of the 6000 stars visible to the naked eye is a white dwarf. Explain why the second statement is not inconsistent with the first. In a spiral galaxy, supernovae occur at the rate of 1 every 100 years. If you were given access to a small telescope, describe how you would check this estimate. Our Galaxy is a typical spiral galaxy.