None. In theory there are parts of space that are a true vacuum but not everywhere, and definitely not near planetary bodies. There's a reason our satellites n

None. In theory there are parts of space that are a true vacuum but not everywhere, and definitely not near planetary bodies. There's a reason our satellites need station-keeping fuel. https://en.wikipedia.org/wiki/Orbital_station-keeping https://en.wikipedia.org/wiki/Orbital_station-keeping