Astronomy > EXAM > ASTRO 001 Unit 4 | 115 Questions with 100% Correct Answers | Updated | Download to score A+ (All)
How many stars do open star clusters contain? - ✔✔hundreds to thousands of stars What kinds of stars are visible in an open star cluster? - ✔✔blue stars How old are stars in an open star clu... ster? - ✔✔relatively young Pleiades - ✔✔example of open star cluster How many stars to globular star clusters contain? - ✔✔hundreds of thousands to millions of stars What kinds of stars are visible in a globular star cluster? - ✔✔red giants (yellow in color) How old are stars in a globular star cluster? - ✔✔relatively old, many have ages around 10 billion years How can you determine the age of a star cluster? - ✔✔by seeing what spectral class of star has most recently "turned off" of the main sequence How are planetary nebulae formed? - ✔✔when stars run out of nuclear fuel and blow off outer layers [Show More]
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