Question

1. Describe in few steps the formation of milky way galaxy 2. Give contrast between Normal galaxies and Active Galaxies. only) of galaxies. (Picture Only 4. Draw and explain the possible fate of the universe. 9. Elucidate the stellar evolution of Sun 10. Draw HR diagram. Label the axis and locate the followings: Red giant, Red Supergiant, Blue Giant, Main sequence, White Dwarf. Extra credit: 10 Points Explain your ideas about blackhole. discuss what do you know about it, how did they capture the image? Have you seen the recent image of the black hole? If so, briefly 7. Discuss the steps to determine distance of any star by spectroscopic parallax 8. Define the following terms: Light year, Variable star, Hubble's Law, Cosmological Principle, Dwarf Only) galaxies. (Picture ubble classification of gala tion and show the di t fferent h 3 Draw 4. Draw and explain the possible fate of the universe.

Answer 1

1.Following are the steps of formation of Milky way galaxy

1. It starts with merging of small galaxies together.

2. Galaxies which has merged together starts conserving their rotation.

3. This rotation starts flattening material into a disc form.

4. Advent rotating disc stabilizes and galaxy is formed.

We can also explain formation of Galaxy through ELS model. According to this model there is single cloud of gas which is the result of rapid collapse. This lead to formation of star which also contains global Le clusters and has dynamic structure of metal poor gases, stars travelling in an elliptical orbit around the galaxy in the halo form. Later when the cloud collapses on axis of rotation it forms a disc in evolution form which is further contained by different kind of metals and hello stars. The revolving disc is a free enriched gas having a bulge in the centre.

2. the main difference between normal Galaxy and active Galaxy is that in normal Galaxy the total energy emitted by the Galaxy is sum of all the emissions from all the stars in the Galaxy where as in active Galaxy this is false. Inactive Galaxy, the dense central region of the Galaxy is responsible for giving energy to two black hole of the Galaxy which is in supermassive form.

Active galaxies have more luminosity than normal galaxies. The nucleus of active Galaxy is larger than nucleus of normal galaxies also active galaxy have the gigantic Jets which points out of the galaxies.

3. Image attached

nel axies C Bul increasin Sa. So SB S Ba Tri Bamed Spals SB (Age decreasingly htm

4. The expanding universe can be slow down only due to pull of gravitational force. So, the ending of universe depends on how much matter we have for the survival of universe just like stars.

The ultimate fate of universe depends on re collapsing or closing of universe where mass density is greater than critical density then comes critical or flat universe where right amount of mass per unit volume is present then comes coasting or open universe where mass density is less than critical density and finally there is accelerating universe where expansion is completely slowed down but only acceleration survives.

Image attached (sketch)

aranog