AIR & SPACE MAGAZINE Celestial Heavyweights Yet they move like welterweights and featherweights. Images: NASA, ESA, J. Walsh (ST-ECF), and ESO; J. Alves (Calar Alto, Spain), and B. Vandame and Y. Beletski (ESO) May 11, 2010 Matt Hale Get the latest stories in your inbox every weekday.
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