1) Impact crater on Mars
Found on
https://www.crosswordclues.com/clue/ritchey
[Martian crater] Ritchey Crater is a crater in the Coprates quadrangle on Mars, located at 28.8° South and 51° West. It is 79 km in diameter and was named after George W. Ritchey, an American astronomer (1864-1945). Ritchey Crater is interesting to scientists because it displays several different layers. A dark layer at the top forms a ca...
Found on
http://en.wikipedia.org/wiki/Ritchey_(Martian_crater)
[lunar crater] ==Satellite craters== By convention these features are identified on lunar maps by placing the letter on the side of the satellite midpoint that is closest to Ritchey. ...
Found on
http://en.wikipedia.org/wiki/Ritchey_(lunar_crater)
No exact match found.
