To receive full credit, all answers must be typed, grammatically correct, and all sources must be properly referenced.
Do not copy material; answer in your own words. The questions are each worth five points.1. Suppose we look at a distant quasar. If an inhabitant of the host galaxy of that quasar looked at the Milky Way at the same time we looked at their galaxy, what kind of object might they see? Explain. How would the color of light they observe be different than the color of light emitted by the Milky Way? Explain.
2. What is Hubble’s Law and how can it tell us the distance to a galaxy? Hubble’s Law contains a constant (labeled H, the slope of a line). How is the value of the constant determined? Suppose the accepted value of the constant was found to be incorrect in the future. Would we have to change our ideas about the evolution of galaxies? Why or why not? Would it change our estimate of the age of the Universe?Explain.1. I thought he might see the Milky Way Galaxy but not any stars in the MW galaxy because that quasar is the most distant galaxy from us, which is also brightest and most active.
Comparing with it, other galaxies and their stars may look darker and the MW galaxy may look like a point or spot, which is little bright. The color of light they observe could be more shinning than the light emitted by the Milky Way. It also displays differently on the spectrum of normal light because the apparent stars in the quasar are not actually stars and other stuff was found near the bright nucleus. This stuff may eventually be the reason of galaxy’s brightness and explanation of different color of light2. The Hubble’s Law is an evolution of distance indicators, which used for calculated the distance of galaxies.
It involves spherical distance compared with redshift of distant galaxies. Edwin Hubble found that the farther galaxies tend to have larger redshift than the close galaxies have, which means farther galaxies have bigger velocity of motion than close galaxies. The distance to galaxy = velocity of galaxy / slope of line The rough positions of galaxies are plotted into the graph that shows the relationship between distance and velocity and those positions shows the order of galaxies and determined by the measurement of cosmological distance ladder.As long as the new galaxy appeared, its distance to us would be estimate by the redshift via distance indicators and it would be added into the graph.
The value of constant determined by galaxies velocities and their distance to us. No we have no need to change our ideas about the evolution of galaxies because constant value depends on the distance indicators and distance indicators set scale, not placement, and the order of galaxies would not change. I think it could change our estimate of the age of the Universe because it relates with the actual motion of each galaxy, their velocity and distance to us.
