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Last updated on April 16, 2014 at 12:31 EDT
M3 Globular Cluster
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M3 Globular Cluster

June 26, 2004
A sixth magnitude globular cluster in the constellation Canes Venatici, this ball of 500,000 stars is approximately 160 light-years across and 100,000 light-years from Earth. This image of M3 is a combination of a B-band image and a Z-band image (Z is approximately from 8500 to 9500 A) taken on March 22, 2003, at the WIYN 3.5-meter telescope in 0.4 arcsec seeing. The image was taken with the WIYN Tip-Tilt Module (WTTM), and will be used to study the variable stars in the cluster.