According to "When Is a Planet Not a Planet?" scientists determined that Pluto was not a planet. What were the causes that led them to this conclusion? Select three answers. A. Pluto also orbits around another sun. B. Pluto resembles a moon more than a planet. C. Pluto’s orbit crossed over the orbit of another planet. D. Pluto’s orbit is not the same shape as the orbits of the other planets. E. Scientists believed the theory that the outer planets were all made of gas, and Pluto had a rocky core.