Evolution in Zero-Gravity Space
Almost twenty years prior to humanity's technological breach of Earth's outermost atmosphere, eye-witness accounts of the bodies of small beings who had crashed in New Mexico qualify scientifically as morphologically sound. That is, prior to any public scientific understanding of what evolutionary effects zero-gravity might impart on an advanced (mammalian?) biological entity, Roswell witnesses provided a physiological description of distinctly non-human, but, humanoid creatures who's visible anatomical qualities are considered today as logical zero-gravity developments.
To further explain this important fact, let us first examine a variety of physical attributes found on Earth, who's evolutionary developments are directly attributable to their respective environments.
Physical Size:
While dinosaurs may once have ruled the Earth, time passed and smaller species inherited it. Why? Simply because a smaller creature requires less. Less habitat and less food, which means a more prolific lifestyle, due to less competition. Therefore, evolutionary advancement is related to physical stature diminishment.
Quadruped to Biped to Larger Brains:
While still a subject of heated debate, it is generally accepted that advanced hominid evolution led to our ancestors standing up, in order to have a superior visual field. This in turn led to a rapid development in cranial capacity; from the 400 cubic centimeter brains of the Australopithecines (Lucy) of approx. 4.5 million years ago, to the 12-1500 cc (on average) brains of modern Homo sapiens sapiens beginning approx. 300,000 years ago. Evolutionary speaking, this is a remarkably rapid development. Nonetheless, evolutionary advancement is related to bipedalism and increased cranial capacity/brain size.
Filament Quality/Quantity:
Humankind is often incorrectly called the hairless ape. Fact is, that our heads, for one, have as many filaments (hairs) as do gorillas (remember that we are less than 2% different genetically). Furthermore, so do our bodies. What we have less of is filament length and thickness. Our 'fur', though softer and finer, is as prolific as any lower apes. But the appearance this engenders is one of hairlessness. Therefore, like the whooly mammoth to the modern elephant, evolutionary advancement is related to filament diminishment.
Epidermal Pigmentation:
Perhaps one of the greatest evolutionary enigmas in relation to humanity, is the wide variety of skin color. Many anthropologists have postulated upon latitudinal influences, and/or migrational influences. But neither theory truly stands up to evolutionary logic. What is more likely an explanation is solar radiation exposure related to hominid environmental occupation. The darkest human epidermal pigmentation is found on two continents, Africa and Australia (which at one time were connected directly to each other - Pangea). The next 'lighter hue' encompasses the native occupants of Asia, North America, and South America. Caucasoid pigmentation originated in the higher latitude European (Scandinavian) and Russian continental areas. Basically, what we have is a pattern of dark pigment diminishment to caucasoid coloration, in direct relation between desert/lowland denizens to mountainous (overcast weather patterns)/troglodytic (cave) occupation. Therefore, like the pigmentless (transparent - beyond albinoism) species of cave fish and amphibians, evolutionary change in epidermal pigmentation is related to solar radiant exposure.
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