Elliptical galaxies are dim collections of older stars, so they don't shine as brightly as spiral galaxies but they're the most common type of galaxies in the universe.
from Space.com http://bit.ly/2vEfukp
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By BY RAYMOND ZHONG from NYT Technology https://ift.tt/2ZVzHzt
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The blood-red color of the moon during a total lunar eclipse may be difficult to explain without a basic understanding of orbital mechanics,...
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NSF's 10 Big Ideas Since 2017, NSF has been building a foundation for the Big Ideas through pioneering research and pilot activities....
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