A few multiple choice questions im having trouble with... 1. If a star formation

Question

A few multiple choice questions im having trouble with...

1. If a star formation switched off in a spiral galaxy, which partof it would get fainter? Bulge, disk, halo, dark matter or globularclusters?

2. What is the essential difference between formation of spiral andelliptical galaxies?
a. random motions of stars are larger in ellipticals?
b. spiral galaxies had a more recent tidal encounter with anothergalaxy?
c. ellipticals form stars before they collapse; spiral form starsafter they collapse?
d. spiral galaxies rotate faster
e. ellipticals had a more recent violent encounter with anothergalaxy?


3. The temperature of the background radiation is almost the samein all directions
a. this is suprising, because the radiation from oppositedirections in the sky is comming from places that are beyong eachothers light travel horizon
b. this is expected because the big bang was a very homogenousexplosion
c. this was a measurement error in early observations nowdiscredited.
d. the statement is not true, the temperature shows a largefluctuation all over the sky
e. none

thanks in advance!!!

Explanation / Answer

1. If a star formation switched off in a spiral galaxy, which partof it would get fainter? Bulge, disk, halo, dark matter or globularclusters?    not sure what this question isasking... but I would say "disk" since that is where star formationtakes place. 2. What is the essential difference between formation of spiral andelliptical galaxies? a. random motions of stars are larger in ellipticals? b. spiral galaxies had a more recent tidal encounter with anothergalaxy? c. ellipticals form stars before they collapse; spiral form starsafter they collapse? d. spiral galaxies rotate faster e. ellipticals had a morerecent violent encounter with anothergalaxy?         correctanswer... the other answers are silly 3. The temperature of the background radiation is almost the samein all directions a. this is suprising, because the radiation from oppositedirections in the sky is comming from places that are beyong eachothers light travel horizon b. this is expected becausethe big bang was a very homogenousexplosion       correct... again,other answers are silly c. this was a measurement error in early observations nowdiscredited. d. the statement is not true, the temperature shows a largefluctuation all over the sky e. none thanks in advance!!!

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