I've had run-ins with griefer-planets myself. One, which I'd better just describe as big, blue and full of gas (no, I'm not talking about a political party) insisted on interdicting the sunlight as I made yet another attempt to raise my polonium stocks above a number I could count on my thumbs, while prospecting its inner moon (an ugly yellow thing apparently made of pre-consumed water). Night I could deal with, but sudden eclipses are another thing entirely. What was worse was that when I came back the following day, the darned gasbag did exactly the same thing again. I'm sure that the 'astronomer' faction on this forum (always ready with excuses, that lot) will blame it on 'rotational periods' or something, but I'm sure it was intentional. Clearly greifing, with the express intent of making me drive my SRV into a crevasse. I think that at minimum FD should give the planet a stern warning, and consider suspending its account if it does it again.