23857122-0457-180273-0403

evoluttior y have the rigors of the may have perished. possibility, can withstand the race CJ een sufficiently AS gf st being trolled. 2cond developed a who Martian climate. Or ID t | "These possidvilities have expanded in the pseudo-scientific literature to make further amplifi- cation superfluous. However, there may exist some interest- Ge ing restrictions to the anatomy and physiology of a Martian. Rarity of the atnosphere, for example, pletely altered respiratory may require a com- system for warm-blooded creatures. If the atrospherte pressure is much below the vapor pressure of water at the body temperature of the individual, the process of breathing with our type of lungs becomes impossible. On Mars the critical pressure for a body temperature of 98.0F, occurs when a column of the atmosphere, contains one sixth the olum on mass of a similar ec the Earth. or a body temperature of 779 F, the oriticar maaq ratio .ts dae to about one twelfth, and at 60" . to about one twenty-fourth. These critical values are of the sam= order as the values estimated for the Martian beeen Accordingly the anatomy and phys- tology OF a Martian may be radically different from ours - but ben 4 is all conjecture. Ve do not know the origin of ve vo UNS coin Ho real The Bi eh on ” hl & fo Pa to : ad co ds saa HA Sa ae roe. 8 wii? observe orm ris ergal any si own op Sa Bae § tk an ad 4 (ua Lite, even on the Barth. s of antellizcent iife on »® inion. If he believes tha at intellivent beinzs may ars. t the ha Ve once developed on Mars, he has only to imagine that they pa ie i for countless senerations in a rare atmosphere which © is nearly devoid of oxygen and wster, and cn a planet where the “hts are much colder than our arctic winters. The ex- e 4 | istance of intelligent. life on Mars " Dub Lo CLs Je s not impossible completely unproven. ‘. nm 5 ie ~ 2 % é It 1s not too unreasonable to go a step further and consider Venus as a vossible home’ for ‘intelligent life. The atmosphere, to be sure, ° g> ~ b 2 3 ee ie a ) Ae ra) epparently corsists mostly of! carbon dioxide with deep clouds of droplets, and there seems to be little or no water. . 8 4 + P Png, ee re ¥ s - 4 P a be 4 a et livine orranisms might develop in chemical environments that ; 1 o a“ e i i } pa. are strange to us: the vegetable kinzdom, for example, operates on a fundamentally different energy cycle from Man. Boc lies might i other know. One thing manufacture within that do not exist as ctent and micht well : J cif chemicals an Wwe ferent the creatures mamnals all compounds gelf-suffic aa eonstructed a] 4 -" " a be | i ? aM and operated with oh. 34 Co 1 ¢ vrpincipies than at ta. ed dane. Tis sects, and their own lex chertcal bodie i a } , , minerals. To tris extent, adant itself to any environment within certain limits o* temperature (and size of creature). mas PE Oe 38, and ller) and her tr } ae 1 ae a a Oi Ps ee ee ei Rf oy Was 7) Jenus has two band! caps relative to Mars. Her arly as lsrzve as for the Farth (Mars is sma Qrea Joe are Nn a af 28 Declassification Authority: NND 57565