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Earthsky Tonight—May 13, 2010: M13, the Great Cluster in Hercules
Posted By Gary Wamsley On May 12, 2010 @ 11:48 pm In Earth & Sky | Comments Disabled
Courtesy of EarthSky
A Clear Voice for Science
Today’s chart shows the location of M13. It is about a third of the distance along a line between the stars Eta and Zeta Hercules. We are not showing you what the cluster looks like on this chart – and in the sky, you’ll see it differently, depending on what instrument you’re using.
To the eye alone, M13 is barely visible. You would need the darkest possible sky – and the best possible conditions – even to glimpse it. However, binoculars will pick up the cluster as a hazy spot of light. A telescope would reveal a glorious cluster  of stars – symmetrical in shape – with stars more closely packed at its center.
Globular star clusters such as M13 are thought to be our galaxy’s most ancient inhabitants. Billions of years before our sun formed, the stars of M13 were burning brightly!
Written by Deborah Byrd
StarDate Online 
National Geographic 
Space Com 
Amazing Space 
Scope City 
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URLs in this post:
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2010/05/May-14_phases_New-Moon.jpg
 www.EarthSky.org: http://www.EarthSky.org
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2010/05/10may13_430.jpg
 glorious cluster: http://www.noao.edu/image_gallery/html/im0551.html
 Astronomy Picture of the Day from NASA/JPL: http://antwrp.gsfc.nasa.gov/apod/
 CHANDRA Photo Album: http://chandra.harvard.edu/photo/
 U.S. Naval Observator Astronomical Information cente: http://www.usno.navy.mil/USNO/astronomical-applications/astronomical-information-center/astronomical-information-center
 StarDate Online: http://stardate.org/
 Sky and Telescope: http://www.skyandtelescope.com/observing/ataglance/
 National Geographic: http://news.nationalgeographic.com/news/
 Space Com: http://www.space.com/nightsky/
 Amazing Space: http://amazing-space.stsci.edu/tonights_sky/
 The York County Astronomical Society: http://www.ycas.org/tonights_sky.htm
 Scope City: http://www.scopecity.net/
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