Q: Hiya, Firstly a big thanks for all the help you have given me so far. It as been extremely useful in helping me understand my Astronomy course much better. My questions for today are: Does a cool star of about 3500 degrees C emit UltraViolet radiation? What is the evidence that Protostars form after a collision between gas clouds?
A: Cool stars in that temperature range appear reddish or orange to us; they emit only small amounts of UV radiation (hot stars produce much stronger UV emissions).

 

 
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