With information gathered by NASA's Hubble Space Telescope, scientists have uncovered clues about why galaxies that have stopped forming stars, or are "quenched," once appeared smaller than they do today. "We found that a large number of the bigger galaxies instead switch off at later times, joining their smaller quenched siblings and giving the mistaken impression of individual galaxy growth over time," said Simon Lilly of the Swiss Federal Institute of Technology, the study's co-author.

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