[lunar crater] The interior of Lassell has been flooded and resurfaced by lava, leaving a nearly flat surface with a low remaining outer rim. The surface has a low albedo, giving the interior a dark appearance. The surviving outer wall is generally circular but with a somewhat polygonal shape. To the east-northeast is a circular, bowl-shape...
Found on
http://en.wikipedia.org/wiki/Lassell_(lunar_crater)

(from the article `Neptune`) The other five known rings of NeptuneGalle, Le Verrier, Lassell, Arago, and Galatea, in order of increasing distance from the planetlack the ...
Found on
http://www.britannica.com/eb/a-z/l/18
No exact match found.