Compact Bone. The next layer is made up of compact bone. It is a smooth but hard quality, with minimal gaps and spaces. This layer gives bones their white and solid appearance, and it is the part that you see when you look at a skeleton.
He used the inverse square law of light brightness on a particular type of variable star in those old star clusters. Some stars are very useful for finding distances to clusters and to other galaxies because they have a known luminosity that is large, so they can be seen from great distances away.ll of the RR Lyrae stars in a cluster have the same average apparent magnitude. In different clusters, the average apparent magnitude was different. This is because all RR Lyrae have about the same average absolute magnitude (=+0.6, or 49 solar luminosities).
Answers. Best Answer: Cepheid variables are a class of bright, variable stars, with the property that the period of the variation is related to their absolute luminosity. So they can be used to determine the distance, by comparing the measured apparent luminosity, with the absolute luminosity as deduced from the period.est Answer: Cepheid variables are a class of bright, variable stars, with the property that the period of the variation is related to their absolute luminosity.