Back in the late sixties, when Marvel Comics was throwing all sorts of wild and bizarre ideas at readers and most of ’em, true believers, stuck, Smilin’ Stan and Jolly Jack introduced Ego, the Living Planet, in the pages of Thor. I would gently suggest that Jack Kirby managed the concept of a living planet with a little bit more magic and wonder than Samuel A. Peeples and the Filmation crew could bring to this story of two living planetoids, named Ergo and Tarr.
On the other hand, our son was really quite impressed. “That was SO COOL when the asteroids were alive!” he said. If you insist, kiddo.