When a 
protostar forms,it starts out at the top of the Hayashi track with a luminosity of 
and a temperature of 3,600 K.What is its radius at this point (give the answer in units of 
),and how many times larger is it at this stage compared to its radius as a main-sequence star,which is about 
? For reference,the Sun's temperature is 5,800 K.
Definitions:
Restructuring
The process of reorganizing a company's structure, operations, or finances with the aim of improving efficiency and profitability.
Unlevered Cost
the cost of a project or investment without considering the financing aspect, such as interest expenses on debt.
Unlevered Cost
The cost of capital or investment that does not consider the effects of debt financing, reflecting the cost of equity alone.
Bonds Outstanding
Refers to all the bonds issued by a company that are still in circulation and have not yet been redeemed.
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