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Fossil globular star clusters reveal their age

28 July 2015 Astronomy Now

Using a new age-dating method and the W. M. Keck Observatory, an international team of astronomers have determined that globular star clusters formed in two distinct epochs — 12.5 and 11.5 billion years ago. They formed alongside galaxies, rather than prior to galaxies, as previously thought.

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‘Fluffiest galaxies’ discovered by Keck Observatory

16 May 2015 Astronomy Now

An international team of researchers have used the W. M. Keck Observatory to confirm the existence of the most diffuse class of galaxies known in the universe. These Ultra Diffuse Galaxies (UDGs) are nearly as wide as our own Milky Way galaxy — about 60,000 light-years — yet harbour only one percent as many stars.