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The Pleiades are one of the
finest and nearest examples of a reflection nebula associated with a
cluster of young stars. The cluster
itself is a group of many hundreds of stars about 400 light years from
Earth in the northern constellation of Taurus and has been recognised
since ancient times. Seven of the brightest
stars are quite easy to see with the unaided eye and bear the names
of the Seven Sisters, the daughters of Atlas.
The nebulosity seen here is
light reflected from the particles in a cloud of cold gas and dust into
which the cluster has drifted. It appears blue because these tiny interstellar
particles scatter blue light more efficiently than the longer wavelengths
of red light and it is streaky because of the distribution of dust particles
in space.
Photo and description courtesy
of the Anglo-Australian Observatory.