A closer look at "Sputnik" crater by Opportunity?
In this thread on bautforum.com I speculated the feature called "Sputnik" crater might be a volcanic vent:
A volcanic fissure at Victoria crater?
http://bautforum.com/showpost.php?p=852014&postcount=39
It's the roundish feature below and to the left of the "Duck Bay" label in these annotated Hirise images:

Opportunity is headed back to Duck Bay as a possible entry point into Victoria crater. Perhaps the rover could take a look at Sputnik first before entering Victoria.
Bob Clark
