above around 140km up astronomy sensor data suddenly spikes in noise (before slowly decreasing as you approach the moon). I found this issue two times; once, I was measuring gravitational acceleration at various altitudes, using two delta blocks on the altitude given by the astro sensor, and noticed that any data from above that height was basically unreadable because it kept jumping around so much. The second time I encountered the issue was when I was testing my navball (https://steamcommunity.com/sharedfiles/filedetails/?id=3234223919), and above 140km my display started warping in unexpected ways because it assumed the distance between two adjacent blocks was always 0.25 metres, but the noisy data invalidated this assumption. I also notice that the noisy range coincides with the period your local space is "transitioning" from being relative to the earth, to the moon.