Rockets, Men and Medicine

Abstract

Space Medicine has at last become an accepted entity in the vast field of medical research after many years of ridicule and scorn. The recent successes of the U .S.S.R. and U .S.A. in launching earth and sun satellites would seem adequate to justify the existence of space medicine. It seems Man's avowed intention to conquer the third dimension, the vertical, which leads to space and as such it is the duty of the medical scientist to make this journey as safe as possible for the would-be space traveller.

Space is not a well defined region since it has no accurate topographical boundaries and in the context of this article the best way of defining space is to think in terms of levels of space equivalency, i.e. levels at which various protective functions of the Earth's atmosphere are lost so creating a space-like state for a certain phenomenon at a particular altitude. From the viewpoint of respiratory physiology space begins at a height of 52,500 feet since the effects of explosive decompression assume a constant value at and over this level. In similar terms the atmosphere acts as a filter against cosmic factors and this function of itself provides a variety of space equivalencies ranging from sea level in the case of infra-red rays, to 10-20 miles for cosmic primaries and as high as 75 miles for visible light. Space, therefore, is a concept which of necessity is a variable and its effects may be just as varied.