"The Universe doesn't appear to change all that much on the scale of even a human lifetime, but on grander scales, older stars run out of fuel and die, while new star-formation episodes are triggered."
"The Sun shines with a relatively constant power output of 3.8 × 10²⁶ Watts, due to a nuclear furnace in its core that converts protons into helium-4 nuclei."
"In just over three seconds, the Universe changes in profound ways, with events like star formation and the expansion of galaxies occurring continuously over vast timescales."
The Universe changes significantly over time, even if these changes are not noticeable within a human lifetime. Stars evolve, the Sun continues to burn for billions of years, and the Moon gradually moves away from Earth. Events like star formation and the expansion of the Universe occur over trillions of years. In just a few seconds, the Universe experiences changes that accumulate over time, including the Sun's constant luminosity powered by nuclear fusion in its core.
Read at Big Think
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