ASTR1020 Homework 5CHAPTER 25:1. Explain why we see the Milky Way as a faint band of light stretching across the sky.Because of the gas and dust between stars that absorbs light from stars, a faint band can be seen. Distant stars’ light overlaps and causes a glow rather than crisp resolution.It is composed of a multitude amount of stars that lay in a flattened structure encircling the sky and the number of stars in each direction around an oval structure.2. Explain where in a spiral galaxy you would expect to find globular clusters, molecular clouds, and atomic hydrogen.In a spiral galaxy, globular clusters can be found in regions that are free of interstellar dust and can be seen at large distances. The globular clusters, molecular clouds, and atomic hydrogen can be found at almost distinctly he center of the galaxy.3. Describe several characteristics that distinguish population I star from population II stars.There is no star formation in the center of the galaxy. There are some gas and dust revolving around the black hole with some ionized gas streamers. A lot of mass is stuffed into a small amount of volume.4. Briefly describe the main parts of our Galaxy. The black hole a supermassive black hole lies at the center of the galaxy.The thin disk which contains dust, gases, and young and old stars. The globular cluster seen as a thick disk contains star having properties intermediate between the thin disk and the halo. The nuclear bulge a peanut shaped nuclear bulge of mostly old stars around the center. The spherical halo contains populations of very old stars including RR Lyrae variable stars.5. Describe the evidence indicating that a black hole may be at the center of our Galaxy.CHAPTER 26:1. Describe the main distinguishing features of spiral, elliptical, and irregular galaxies.They each no regular shape for these galaxies do not have distinct regions or parts gravitationalforce is also irregular.5. What is one of the best ways to measure the distance to a nearby spiral galaxy, and how would it be measured?Type Ia supernovae is used to measure luminosity and therefore the distance to a distant galaxy. The luminosity of the spiral galaxy can be measured by measuring the mass and mass is estimated by its orbital velocity. 10. Does an elliptical galaxy rotate like a spiral galaxy? Explain.No, Spiral galaxies are composed of collapsing cloud of gas while elliptical galaxies are formed by the merging of other galaxies. Thus spiral galaxy possesses angular momentum because of gas from its collapsing into disk, while stars in the elliptical galaxy have random orbits for stars.11. Why does the disk of a spiral galaxy appear dark when viewed edge on?It appears bright because of the presence of bright emission nebulae and hot young stars in the arms or disk which means that new star formation is still occurring. Disks are also very dusty.19. Which is redder—a spiral galaxy or an elliptical galaxy?’ Elliptical galaxies And the following questions1. What does the rotation curve of our Galaxy tell us about the Galaxy’s total mass?The galaxy is much larger than expected; luminous part of the Galaxy is merely tip of iceberg.2. Most of the Bright stars in our Galaxy are located in the Galactic (d) disk.3. Globular clusters are found mainly in the (d)Galactic halo.4. In the Milky Way Galaxy, our Sun is located (b) about halfway outfrom the center.5. Most of the mass of the Milky Way exists in the form of (a) dark matter6. Astronomers classify elliptical galaxies (b) how flattened they