Fig 18.15.

(a) HST image of a supernova in a distant galaxy. The larger image shows the cluster of galaxies in which this event took place.The box on the left shows the location of the individual galaxy in which the supernova took place, and the blowup on the right shows the supernova.The brightness of the supernova places the distance to this cluster at 3 Gpc. (b) Measurements of H0 since 1970, with error bars shown for each measurement. [(a) STScl/NASA; (b) John Huchra, CFA]

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