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How can astronomers tell the difference between a group or cluster of stars and an actual galaxy? | Astronomy.com

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How can astronomers tell the difference between a group or cluster of stars and an actual galaxy?

FROM THE June 2012 ISSUE

How can astronomers tell the difference between a group or cluster of stars and an actual galaxy?

Jessica Norris, Mooresville, Indiana

Published: Monday, April 23, 2012

NASA/ESA/K . McQuinn (University of Minnesota, Minneapolis

Most telling is that, aside from a few local ones, galaxies exhibit large shifts toward the red end of their light spectra, which reveal that they are receding from us at high speeds due to cosmic expansion, whereas clusters in the Milky Way do not.