Start with a rough inversion of the chord structure in Beethoven's Moonlight Sonata. Interweave complex harmonies expressing simple statements about our world. Add shape-shifting guitar effects. The result is the song Because by The Beatles. It speaks of the awe and wonder inspired by the simplest of observations - the spherical Earth, rapidly-flowing winds, the blue sky. Each of these topics has a profound basis in physics and astronomy. Follow the tune while we explore gravitational forces, accretion flows, Doppler shifts, light scattering, and black holes.