Since the Sun is changing 4M tons of matter into energy every second and that energy eventually makes its way to the surface and is emitted as an outbound sphere of EM radiation, then the planets' orbits would change over time due to the less massive Sun at the solar system's core. It would seem that there would be a slow outward spiral of each planet. But is this not perceptible by our instruments? Are other factors countering this effect? Does the Sun gain enough mass from interstellar debris that its gravity sucks in to make up for the difference in matter-energy change due to the thermonuclear processes at its heart?