1)describe the structure of the milky way galaxy and the types of star clusters
ID: 161139 • Letter: 1
Question
1)describe the structure of the milky way galaxy and the types of star clusters and populations of stars composing it.
2)describe how spiral arms in the milky way galaxy are observed. describe the density wave model of spiral arms.
3.how can cluster H-R diagrams tell us about the history of the milky way galaxy?
4.describe the different types of galaxies in the univers. which are most rare? most common?
5. what is Olber's paradox? list the assumptions made, and the conclusions drawn by Olbers. how can the paradox be avoidede?
6.what evidence is there that the big bang really occured? give two predictions of the big bnag theory and show how they compare with the observations so far.
7. what is the cosmological principle?
8. what is the age problem in cosmology, and how has it apparently been resolved?
9.how can astronomers find the distances to distant galaxies? use cepheid variables and type lasupernovae as examples.
10.describe neutron stars and black holes , what evidence is there for the existence of these objects?
11. describe the lighthouse model of pulsars. what observation confirmed this model?
12. sketch and describe the theoretical structure of a black hole explain why nothing can escape a black hole. explain how black holes might evaportae describe the theory of wormholes.
Explanation / Answer
1. Milky Way is a galaxy contains stars, gas, and dust. All these elements get bound together by gravitational pull. Galaxies varies in size from 10,000 to 200,000 light years and have the luminosities from 109 and 1014. There are two types of clusters such as globular clusters and open clusters. The clusters with old stars are called globular clusters and the clusters with young stars called globular clusters. Stars in Milky Way are divided into two basic groups such as population I stars and population II stars. Population I tars formed in a dusk shaped structure in an order. Population II stars formed in random pattern with eccentric motion.
7. Cosmological principle says that the distribution of matter in the Universe is homogeneous and isotropic on large scale. This is due to the forces are expected to be act uniformly from end to end out the universe.
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