How is the thermonuclear burning phase during a star's stable life characterized regarding energy?
Answer
Exothermic, releasing required energy.
This thermonuclear burning phase is exothermic, meaning it releases the energy necessary to counteract the crushing force of gravity and keep the star stable temporarily.

Related Questions
What role do supernovae play in cosmic element creation?What is the initial element fused in a massive star's core?After hydrogen fuses into helium, what elements result when helium ignites?Which element marks the termination point for standard, energy-releasing stellar fusion?What happens to the net energy balance when fusing iron nuclei in a star's core?What is the primary mechanism for forging elements heavier than iron in a supernova explosion?How is the thermonuclear burning phase during a star's stable life characterized regarding energy?What physical mechanism immediately precedes the supernova explosion?Which group of elements are primarily created during the star's stable, pre-collapse life?How does the dispersal of elements created by slow pre-collapse fusion compare to heavy r-process elements?Which elements are cited as examples of those synthesized via the explosive r-process?