Hello everyone, First time posting here on the forums. I have been playing ksp on and off for the past year now. I just started playing again recently and started to build a space station. It's the largest I have built yet but I have noticed my periapsis seems to be slightly dropping since the first piece I sent up. When I started building the station the periapsis was around 99.8 km with my apoapsis being about 101 km. I have brought up quite a few pieces since then, I have a refueling adapter put up, 2 solar arrays, and around 6 or 8 living units (containers, pods, science labs/cuppola). Now my periapsis is currently at 98.973 km, which to me seems like a pretty significant drop. I will be in map mode and I can also see the periapsis slightly dropping. Is this a normal thing that I shouldn't worry about? Or is it something that will affect my station significantly like continually dropping till it de-orbits? I'm not anything close to a scientist, but it seems strange to me that it keeps dropping when I (believe that I am) am in a stable orbit quite a bit above the atmosphere so I shouldn't have to worry about falling back to Kerban. Any help would be greatly appreciated! Thank you fellow kerbalnauts! Kerbatron343