What is a protostar? Is a protostar in energy balance? Why or why not? [10 pts] The strange behaviour of stars during formation means we have to carefully consider what their situation is.

astronomy writing question and need the explanation and answer to help me learn.

READ THE DOCUMENT AND FINISH IT
All the questions you need to answer are in the word doc which I upload, and Make sure to write all answers in your own words.
Requirements: answer all questions
Winter HW4?Description:?Strange Stars
In this homework you will work on some of the various types of stars we have explored in this class, from brown dwarfs to protostars, from low to high mass stars, this homework will cover them all. Make sure to write all answers in your own words for full points.
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[10 pts] Some of the strangest stars are protostars, see if you can answer the following:
What is a protostar?
Is a protostar in energy balance? Why or why not?
[10 pts] The strange behaviour of stars during formation means we have to carefully consider what their situation is. Give your best description for the following:
Why does it make sense for star-forming clouds to be cold and dense?
What event brings the forming star into energy balance?
[10 pts] What have you learned about star behaviour? Enter your best answer for the following:
If you had a normal spectral sequence, ?OBAFGKM would give you the stars in order of decreasing temperature, what would the sequence be if you listed those SAME spectral types for main sequence stars in order of INCREASING mass?
What is the fate of an isolated brown dwarf?
[16 pts] This question requires you to MATCH the number on the right to the correct keyword on the left.
There are 8 keywords to match so enter the matching number in the middle column. You get 2 points for each correct match. Make sure to enter the number in the middle column clearly to get all the points.
[42 pts] This diagram represents the life track of a 1 solar mass star from its pre-main-sequence stages to just before its final death. Refer to the life stages labelled with roman numerals. Use the diagram to answer the following questions. You get 7 points for each part.
During which stage is the star’s energy supplied by primarily by gravitational contraction, and why?
During which stage does the star have an inert (non-burning) helium core, and why?
Which stage lasts the longest, why?
During which stage does the star have an inert (non-burning) carbon core surrounded by shells of helium and hydrogen burning, and why?
What will happen to the star after stage viii? Explain!
During what stage is the star burning hydrogen to helium in its core, why?
[12 pts] Provided are various stages during the life of a high-mass star. Rank the stages based on when they occur, from first to last by putting the names (as shown in the boxes) for each object into the table below the images. You get 2 points for each correct answer.