In case you missed it: On her mission’s last day, Spirit’s solar panels reflect sunlight as orbiter passes over.
The HiRISE project aboard the Mars Reconnaissance Orbiter shot this image on May 25, the day NASA ended Mars Exploration Rover Spirit’s mission and attempts to contact the rover.
Alfred McEwen and Mike Mellon of HiRISE:
We were surprised to see that the Spirit rover itself is the brightest spot in the image, unlike dozens of previous images of both rovers. Analysis of the illumination and viewing geometry and the tilt of the rover indicate that, by accident, we imaged it near the specular point for the flat solar panels. The specular point is where the illumination angle is the same as the viewing angle, and the vectors are aligned.
This is now my desktop background. :)