Pogo Planet by Donald A. Wollheim

As my ship hit the darkness that was the outer atmosphere of Midplanet, I thrilled to the thought that I, Ajax Calkins, had at last achieved my rightful place among the pioneers of space. Even when my ship bounced on the green soil, flew end over end upwards to come down ka-plunk in the wrong side of a gooey thick swamp, I exulted that I was the first in possession of a major planet that had been overlooked by the rest of the interplanetary crowd.

As I picked myself up from the midst of a pile of miscellaneous equipment, hiking ropes, elephant guns, para-rays, spare shoes and cans of Unifood, and rubbed my bruised arms and head, I thought of how many millions would give their all to be in my place.

Midplanet! How the whole system had thrilled when its discovery was finally determined last year! For decades science had known there was a planet between Saturn and Uranus, ever since Pickering had proved the perturbations of those planets' orbits pointed to a body between them. Yet telescopes had always failed to detect it. Few had taken it seriously. Yet, it was there.

It was discovered finally by electromagnetic induction coils at the Mars Prime Observatory. It was rechecked from Flagstaff and searched for by Tycho Eye. The latter could not see it. It was still invisible, a strangely dark world.

It was then that I conceived my great idea. For years I had secretly nourished my grievance against the world into which I found myself born. All the great heroic acts had been done. The major planets pioneered, Gretelspoon had at last opened up Pluto, and there was nothing left for me to do to show that I too was made of godlike stuff. But Midplanet ... there was my chance!