How have astronomers learned about the life cycles of stars?
A) through laboratory experiments
B) by studying the Big Bang
C) by studying the complete life cycles of individual stars
D) by measuring the properties of many stars at a single instant

Question

Quizplus · Accepted Answer

Astronomers learn about the life cycles of stars by observing and measuring the properties of a vast number of stars at various stages of their life cycles at a single instant. Since stars exist for millions to billions of years, it's not feasible to observe the complete life cycle of a single star. Instead, by studying many stars at different stages of their evolution, astronomers can piece together the general life cycle of stars.

How Have Astronomers Learned About the Life Cycles of Stars