A Stellar Dynamic

The Pleiades, a corner of the universe where stars are born. NASA, ESA, AURA/Caltech, Palomar Observatory. Public domain.

The forces at work in a star are, on one hand, inward gravitation, and on the other, outward radiation: a constant explosion balanced by gravity. Gravity doesn’t change much, but stars run out of & change fuels, so big events happen. You’re a star.