فایل: شماره شناسایی
pdf برای دانلود کردن این فایل، لطفا وارد سیستم شویدStars vary in size, mass, temperature and brightness. This resource describes the life cycle of stars and discusses some of their characteristics. This resource is relevant to Astronomy in Physics.
https://web.archive.org/web/20190402002249/http://www.world-builders.org/lessons/less/les1/main.html
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