This week's questions are about stellar birth.
The answers should all be 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. As we talked about in class Wednesday, low temperatures are necessary in a cloud in
                    order for it to start the contraction/collapse that takes it toward starhood.

         How does an interstellar cloud manage to cool off in order to become a contracting protostar? 
        (since the generic answer to this question is pretty obvious
        {after all, how does anything cool off?} I need some specificity and details here...

        and note that I'm NOT asking about how an already-formed protostar is cooling off, but about
        a cloud that wants to turn into one is cooling down!
        

   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.