There isn’t a scale large enough to weigh galaxies like NGC 7714. ESA, NASA; Acknowledgement: A. Gal-Yam (Weizmann Institute of Science) How do scientists weigh celestial objects? Mike Sackheim Evanston, Illinois It’s true that you can’t simply place a planet or galaxy on a scale to measure how heavy it is. Luckily, astronomers have aContinue reading “Ask Astro: How do scientists weigh planets and other celestial objects?”
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