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Forty Ways To Know A Star Novelty Books Dishwasher safe/BPA-FreeStars, the building blocks of the universe, are simply luminous spheres of plasma held together by gravity, but there are many kinds and many remarkable examples. Astoundingly, there are at least 100 billion stars in our galaxy and an estimated two trillion galaxies in our visible universe. Understanding the birth, life, and death of stars is key to a knowledge of astronomy. 40 Ways to Know a Star offers forty short essays that explore everything from