Microsoft Word - introductiontoobservingwithgemini_online ...

Our galaxy alone is 587,800,000,000,000,000 miles wide, and it is an extremely small part of the entire universe. Not only that, all matter in the universe is made up of really small atoms. A typical atom has a diameter of about 0.0000000001 meters. Pack these little guys together and they really start adding up: a cubic inch of a solid ... ................
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