 Why have the planet's life forms developed abnormally?
PLANET of DREAD By MURRAY LEINSTER Illustrator ADKINS [Transcriber's Note: This etext was produced from Fantastic Stories of Imagination May 1962. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] Then he knew he was being marooned on a planet of endless terrors. The Nadine was out of overdrive and all the uncountable suns of the galaxy shone steadily, remotely, as infinitesimal specks of light of every color of the rainbow. Two hours since, the sun of this solar system had been a vast glaring disk off to port, with streamers and prominences erupting about its edges. Now it lay astern, and Moran could see the planet that had been chosen for his marooning. The ice-cap, by its existence and circular shape, proved that the planet rotated at a not unreasonable rate. A water-ice ice-cap said that there were no poisonous gases in the planet's atmosphere. Sulfur dioxide or chlorine, for example, would not allow the formation of water-ice. It would have to be sulphuric-acid or hydrochloric-acid ice. Its size, too, told about temperature-distribution on the planet. A large cap would have meant a large area with arctic and sub-arctic temperatures, with small temperate and tropical climate-belts. A small one like this meant wide tropical and sub-tropical zones. The fact was verified by the thick, dense cloud-masses which covered most of the surface,—all the surface, in fact, outside the ice-cap. But since there were ice-caps there would be temperate regions. In short, the ice-cap proved that a man could endure the air and temperature conditions he would find. Moran observed these things from the control-room of the Nadine , then approaching the world on planetary drive. He was to be left here, with no reason ever to expect rescue. Two of the Nadine's four-man crew watched out the same ports as the planet seemed to approach. No natural radiation sounds like that.
 An element was missing during the planet seeding process. This element would've encouraged normal growth.
 The dense cloud cover caused them to grow abnormally large.  The light of uncountable suns caused them to grow abnormally large.  A sulphuric-acid ice cap caused them to grow abnormally large.  An element was missing during the planet seeding process. This element would've encouraged normal growth.