I ran into something funny a few days ago. I was out doing a series of assassinations and in one of them I was directed to go to a planet that was completely black. After I destroyed the target, I made several orbits and could not find any part of the planet that wasn't pitch black. I thought, ‘Is it possible that a pure black planet exists?' and or, ‘This definitely has got to be a bug.' During my final orbit I noticed that there was a large planet that was also black, but was surrounded by a white halo. The mysterious black planet I had discovered was black because it was in the shadow of the other planet!
On a planet relatively near to it's sun, when you land at the border of light/dark, it can be pretty hard to navigate your SRV, because shadows are extremely long and without your SRV light on, you might just dip in and out of darkness and light while driving, if it is a rather hilly planet. It is a great view though, to see the sun that near and partly hidden behind the horizon. Beware of cliffs on such a planet though, you might just not see how deep something is due to it being covered in darkness.