Images for NOAO Press Release 99-07:
Image Caption: M67 is an open star cluster in the constellation Cancer. One of the oldest known such clusters, M67 is believed to be 5 billion years old. It contains approximately 500 stars within its 12 light year diameter and is located some 2800 light years away. More than 100 Sun-like stars in M67 were observed and analyzed by Giampapa.

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  • Image Caption: A histogram of the normalized index RHK, indicative of magnetic activity, for the contemporary Solar Cycle, Solar Twins in M67 (0.63 < B-V < 0.67), and Solar Type stars in M67 (0.60 < B-V < 0.76).

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