The dusty backbone of our spiral arm of the Milky Way is waving. We live near the end of a long, thin stream of gas, dust, and stars, which spirals outward from the center of the Milky Way. Our cosmic ...
Introduction Have you ever noticed seagulls bobbing up and down on the ocean? You might have also seen surfers catch a wave that takes them to shore. Maybe you have floated on a lake, going up and ...
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