Which two processes can generate energy to help a star or gas cloud maintain its internal thermal pressure?

Question: Which two processes can generate energy to help a star or gas cloud maintain its internal thermal pressure?

The two primary processes that enable a star or gas cloud to maintain its internal thermal pressure are gravitational contraction and nuclear fusion. Gravitational contraction occurs when a star or gas cloud is in its early stages of formation, where the gravitational energy is converted into heat as the matter collapses inward. This process can significantly raise the temperature, contributing to the thermal pressure needed to counteract further gravitational collapse. On the other hand, nuclear fusion is the powerhouse of a mature star, where lighter elements like hydrogen are fused into heavier elements such as helium, releasing vast amounts of energy. This energy not only contributes to the star's luminosity but also provides the necessary pressure to support the star against gravity. Both processes are crucial for a star's lifecycle, from its birth in the cold clutches of a gas cloud to its stable years shining brightly in the cosmos.

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