Hubble images of the Omega Centauri starfield from 2002, left, and from 2009, right.
Classification is key to all sciences, but can often cause debate. Within astronomy, fierce debates have raged over the definition of a planet, both on the low-mass end, as well as the high-mass end. A recent paper explores definitions on a larger scale, pondering the definition of a galaxy, particularly, what separates the smallest of galaxies, the dwarf galaxies, from star clusters.
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Read the rest of What is a galaxy? (Vote now!) (704 words)
© jvois for Universe Today, 2011. | Permalink | 5 comments | Add to del.icio.us
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