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Degeneracy pressure and thermal pressure are two forces that support stellar objects against gravitational collapse. Degeneracy pressure arises from the quantum mechanical properties of particles, while thermal pressure comes from the temperature of the object.

Degeneracy pressure is independent of temperature and increases as the object's mass increases, leading to stability in massive stars. Thermal pressure, on the other hand, depends on temperature and tends to decrease as the object cools, potentially leading to instability.

In summary, degeneracy pressure is more important for the stability of massive stars, while thermal pressure is more significant for lower-mass stars.

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