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Birthday · June 9, 2007

Globular Star Cluster M3

June 9, 2007

The cosmos has been expanding since the beginning of time, making room for galaxies, for stars, for planets — and ultimately, for you.

Globular Star Cluster M3

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APOD published June 9, 2007. Credit: Karel Teuwen. A publication-date match, not a photo taken on your date. Independent of NASA.

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Globular Star Cluster M3

Original APOD · June 9, 2007

This immense ball of half a million stars older than the Sun lies over 30,000 light-years away. Cataloged as M3 (and NGC 5272), it is one of about 150 globular star clusters that roam the halo of our Milky Way Galaxy. Even in this impressively sharp image, individual stars are difficult to distinguished in the densely packed core, but colors are apparent for the bright stars on the cluster's outskirts. M3's many cool "red" giant stars take on a yellowish cast, while hotter giants and pulsating variable stars look light blue. A closer look at the deep telescopic view also reveals a host of background galaxies. Itself about 200 light-years across, the giant star cluster is a relatively bright, easy target for binoculars in the northern constellation Canes Venatici, The Hunting Dogs, and not far from Arcturus.

Image credit: Karel Teuwen

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