andlt;strongandgt;Quantum orbits of the planets.andlt;/strongandgt; Conceptual computerartwork showing the planets of the solar system ona model of atomic orbitals. This represents thetheory that the orbits of the planets weredetermined by similar physical principles to thosegoverning the orbits of electrons. Electronscan only occupy distinct energy levels around anatom, rather than having the capability to beanywhere. These quantum levels are determined bythe electronandamp;apos;s energy. The theory that similareffects occur at the solar system scale iscontroversial and not widely accepted, as theorbits can be explained by well-understoodgravitational theory.