I might well be wrong, but I assumed that white spot was just the sun reflecting off of that part of the rover.

I had to actually stop and think "hang on, does 'sun' mean THE sun, or....".

It's cool thinking about a little robot on mars cruising around doing stuff for us, still showing reflections from THE sun.

Worth noting that this particular "little robot", unlike the previous set, is about the size of a car. That's why they could fit more equipment on it. :D