“The outermost planet of the solar technique has a mass 10 occasions smaller sized than hitherto supposed, according to measurements created by Gerard P. Kuiper of Yerkes Observatory, employing the 200-inch telescope on Palomar Mountain. On the basis of deviations in the path of the planet Neptune, supposedly brought on by Pluto’s gravitational attraction, it utilized to be estimated that Pluto’s mass was about that of the earth.
Kuiper was the very first human getting to see the planet as something much more than a pinpoint of light. He calculated that Pluto’s diameter is three,600 miles, and its mass is 1 tenth of the earth’s. It leaves unsolved the mystery of Neptune’s perturbations, which are also wonderful to be accounted for by so little a planet as Pluto.”