The answer is:
8.1 meters and 8.1 bya
G. radiation and convection
<span>Heat in Physics is an energy that is in a process of transfer between a system and its surroundings other than the transfer of matter. In Thermodynamics, a science that deals with the study of heat and temperature and their relationship to energy and work, finer details of the process is unpredictable. Heat flows from a hotter to a colder body when there is a physical pathway. This pathway is suitable and can be direct such as radiation and conduction. It can also be indirect as in convective circulation.</span>
I think that the answer is 12 billion. So sorry if I am not right.
Hello User
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-Chris