Image Credit & Copyright: Lorand Fenyes
Explanation: 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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