Answer: a
Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star its lifetime can range from a few million years for the most massive to trillions of years for the least massive which is considerably longer than the age of the universe.The table shows the lifetimes of stars as a function of their masses.
Star – Star formation and evolution | Britannica
Life Cycle of a Star – Seven Main Stages of a Star …
Evolution of Stars – CliffsNotes
Life Cycle of a Star | National Schools’ Observatory
Stellar Life Cycle | Earth Science – Lumen Learning
Stellar evolution – Wikipedia
Stellar evolution – Wikipedia
The first two were patches of dim white light (by the way there were thin clouds when I saw this) about 1 degree large moving quickly across the sky. “Quickly” in this case means “faster than the high-altitude airplanes that leave visible trails about the speed of the airplanes that don’t leave trails and whose blinking lights can be …
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Red giants are evolv…