COVER NASA Spitzer Space Telescope false-color image of a portion of the Perseus spiral arm of the Milky Way. Bright regions are clusters of newly formed stars. Recent observations with the National Radio Astronomy Observatory Very Long Baseline Array yielded the distance to a newly formed star (in the bright cluster toward the lower left) with unprecedented accuracy and precisely located the Perseus spiral arm. See page 54. Image: C. E. Woodward, G. Ruch, T. J. Jones

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