Embraced in spiral arms.
The Milky Way is the galaxy we live in, one of the countless collections of stars and dust throughout the universe. It’s a reality so basic, grade school kids learn it. But it wasn’t always so obvious. Just 100 years ago, the nature of the Milky Way — and the universe itself — was still a matter of debate. On April 26, 1920, astronomer Harlow Shapley claimed our galaxy was the entire universe. Astronomer Heber Curtis countered that the blurry star clusters seen with a telesco…
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