Day The Earth Stood Still, The (1951) - A Problem In Celestial Mechanics

Alien Klaatu (Michael Rennie) spending the day minding his new house-mate Bobby (Billy Gray), visiting the space ship, which he dares not say belongs to him, then dropping by the Washington, D.C. home of scientist Barnhardt, whom he hopes to approach, in The Day The Earth Stood Still, 1951.