This week's questions are about stellar birth.
The answers are in Universe, chapter 20 (sections 1-3, 7,8) ....  the reason I know this is that I have shamelessly stolen the questions from the "review questions" at the end of the chapter
 

1. a) Why is the presence of a red nebula at some location in a galaxy an indication that stellar birth has taken place there recently? 

        b) is the presence of a blue nebula an indication of recent star formation?  why or why not?

    2. a) Why are very low temperatures necessary in order for protostars to begin the process of gravitational collapse inside of dark nebulae?

     b) How do protostars lower their temperature, as required? 
        (since the generic answer to this question is pretty obvious
        {after all, how does anything cool off?} I'd like some specificity here... 
        how specifically do the protostars cool off?)

   3.  Briefly describe (or list) 3 mechanisms that compress the interstellar medium and thus trigger star formation.
                (as you know, review question #22 says there are 4; you needn't stop at 3, of course.)

I did my own work on this JIT.

Click on the  button to send the results to Kolena or click   to start over.