101 Must-See Cosmic Objects: M22

In 1665, while observing Saturn (which was located in Sagittarius at the time), German astronomer Johann Abraham Ihle came upon an unexpected sight. Just over 2° northeast of 3rd-magnitude Kaus Borealis (Lambda [λ] Sagittarii) at the top of the Teapot asterism, he found a small, nebulous patch. Although he had no idea what he had seen, Ihle had unintentionally discovered the first globular cluster. Today, we know it as M22. The Hercules Cluster (M13) may be considered one of the fin

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