M7 is one of the most
prominent open clusters of stars on the sky. The cluster, dominated by bright
blue stars, can be seen with the naked eye in a dark sky in the tail of the
constellation of the Scorpion (Scorpius). M7 contains about 100 stars in total,
is about 200 million years old, spans 25 light-years across, and lies about
1000 light-years away. The above deep image, taken last June from Hungary
through a small telescope, combines over 60 two-minute exposures. The M7 star
cluster has been known since ancient times, being noted by Ptolemy in the year
130 AD. Also visible are a dark dust cloud and literally millions of unrelated
stars towards the Galactic center.
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