Found an interesting planetary pair. One planet is listed as a moon as it is orbiting another planet, yet they are identical in size, mass, density, and gravity (1.22G). Only difference being the "planet" is Venus like (59atm of pressure, all deadly gasses) while the "moon" is Earth-like in atmopshere. Another oddity is that this is in a nebula. Also, alien civilization detected there... with several ships with active sensors locking on my survey ship.