With those assumptions in mind, we can paint this portrait of the man from Planet X. :
He breathes air. Water breathers might develop some intelligence, but they could not smelt metals under water. This means that any development above the level of our own Stone Age is the accomplishment of air breathers.
He eats both plants and meat. A strict plant-eater spends too much time stuffing himself with food to build the kind of civilization which is necessary to produce a spaceship. Animals which can digest meat only would not be likely to survive the occasional adverse periods which very likely occur on all planets and wipe out the less adaptable forms of life.
Hes probably not much larger than the largest human being. The limiting factor here is something called the spare-cube law. If you double the height of a, person without changing his proportions, you have a being with weight times the weight. This means that a person 12 feet tall, for example, must be clumsy and cannot perform precision work. And precision work will be essential, of course, in building the spaceship.
He weighs at least 40 pounds, and probably more. A brain of a certain size and complexity would be required for the building of a spaceship. The brain of our spacemen would weigh at least 2 pounds. And from our studies of animals on earth, we know that a body weighing at least 40 pounds is required to support a 2-pound brain.
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