amnhnyc: In the latest episode of the web series Shelf Life, How To Time Travel To A Star, Museum astrophysicist Ashley Pagnotta introduces one of her areas of interest: Cepheid variable stars. In 1912 Henrietta Leavitt discovered a way for these stars
tags: ciel62,
from: https://ciel62.tumblr.com/post/115080848116
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