Messier & Messier A                                 Earth-based telescopic image                                          Apollo 11 image .

Larger version of above  Image by Legault

Full-sized version of Apollo 11 image  A11_MP.Orbital4FS

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Brief

Messier is an oval crater elongated in an E-W direction. Its size is 9 x 11 km and it may have originated as the result of an oblique meteorite impact from space. Messier A comprises two circular craters: The younger, eastern crater overlaps part of the smaller, older formation. This twin crater measures 11x13 km.  To the west, two straight narrow rays, resembling the tail of a comet, trail across the surface of Mare Fecunditatis to a distance of about 120 km.

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Other Lunar Orbiter images

http://cass.jsc.nasa.gov/research/lunar_orbiter/img/4-60H3.jpg

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For the latest information and images regarding this section, including Apollo Hasselblad (H), Metric (M), and Panoramic (P) images, go to: Section 48  Clickable Sections Map

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