(English version,
Wikipedia copyright)
Messier
is a relatively young lunar impact crater located on the Mare Fecunditatis.
The crater has a discernable oblong shape that is not caused by
foreshortening. The longer dimension is oriented in an east-west direction.
Just to the west lies 'Messier A', a similar-sized crater with an oblong,
doublet form. The longer dimension of this crater is oriented north-south,
at right angles to Messier crater. This crater also has a curved bulge
extending to the west.
The interior of craters Messier and Messier A have a higher albedo than the
surrounding maria. There is also a dark streak in the center of each crater.
Two prominent, nearly linear rays extend westward from the rim of 'Messier
A', continuing over 100 kilometers toward the east edge of Mare Fecunditatis.
The maria about the craters is also lightly marked by rays from other
craters.
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