Spacecraft designed for Soviet human lunar orbital and landing missions. Gravitational radiation is another mechanism of orbital decay. See Linear combination of atomic orbitals molecular orbital method. Blue Origin began developing systems for orbital human spacecraft prior to 2012. Angular momentum contributes twice as much to magnetic moments than orbital. Solar radiation pressure is a source of orbital perturbations. Suppose that the angular momentum for the orbital motion is L. Antibonding orbitals are also important for explaining chemical reactions in terms of molecular orbital theory. An alternative theory predicts a planet with different orbital parameters. The paramagnetism is due to a net "orbital" (and not spin) electronic angular momentum. This was the first such achievement by a rocket for orbital spaceflight. Its north pole lies below the orbital plane. Bonding is often described using the formalisms of molecular orbital theory. I, which was used for uncrewed suborbital and orbital hardware development. The electrons in an n orbital are typically lone pairs.