I have noticed the last few landings that I have done, various noises as you glide, including bangs, pops and what can best be described as a "thruppp". I thought that they were some sort of audio clue that you were about to come out of the glide. However, on the last couple, I noticed a flash from the planet surface at the same time as the 'thrupp'. I tried to land about where the flas was, but found nothing interesting. Do we know what this means? Have I missed something?