Constellations are named after a Greek or Roman God. They were made to help sailors find their way. Now they are used to help more people find their way. In this world such help is very useful.
Friday, July 17, 2026
Why do Spiral Galaxies have two arms?
"For generations, astronomers have been puzzled by a deceptively simple question: Why do some spiral galaxies have two arms while others have many?"
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