| areo.info / MER / Opportunity / | Sol 3991 Sol 3990 Sol 3989 |
| Sol 3990 local noon on Opportunity landing site was 2015-04-15 20:31 UTC on Earth. | last modified: 2016-01-31 21:49 UTC |
| All Mars images derived from original data published by NASA and JPL on Marsrover Image Gallery and exploratorium.edu. | |