However, practically all solar electric power plants have one general shortcoming - a time-variable electric energy generation. One may compensate some of these difficulties by using different energy accumulators, including those which would be on Earth, however this problem for the present is obviously studied insufficiently. It is impossible to solve problems connected with the steady and economically expedient power supply of space and earthground consumers. Apparently within the next few years it will be necessary to carry out the comparative technical-economical analysis of diverse concept versions of the solar electric power plants and to contemplate the ways of further collaborations in different countries. The interest in use of atomic energy clashes with the fear of great radiation difficulties. However, for many intermediate stages of the global space energetics development it will be highly difficult and ineffective to manage without atomic power plants. Estimations give the evidence of that in developing electric high-power plants in space, it will be necessary to use moonbases, as asteroid materials. Here, of course, it is necessary that a number of various atomic plants be created for both earthground and space applications. It is advisable now to contemplate the plans and to begin their realization in order that one should use these plants which possess a power from 25 to 500 kWt at the beginning of the next century. One of such tasks is an experimental flight towards several asteroids for the purpose of specifying flight conditions and elucidating an asteroid material composition. The result of these flights may exert essential influence upon both the space energy-generation complex development program and flight towards Mars and other major planets programs. The great progress in the controlled thermonuclear reaction prove more and more serious and the question about development of concept schemes like the earthground thermonuclear electric power plants and especially, the space ones. For the present no less important a question is the thermonuclear energy use efficiency. Therefore, it is necessary to carry out such research and engineering, which should confirm the possibility of a technical realization of the direct transformation of the hot plasma kinetic energy into the electric energy; that will offer more opportunities for both starting preliminary projecting of space thermonuclear electric plant and more detailed comparing with the space solar and atomic system destined for earthground, moonground and space applications. The space thermonuclear electric plants have a number of advantages in comparison with power plants of other types. They are more compact, less expensive, capable of the uninterrupted electric energy generation, and they have practically no radioactivity, etc. Therefore, apparently, the interest for thermonuclear systems will naturally increase, and it is advisable to coordinate the diverse investigator efforts with interest. An energy transmission in space remains a very important problem. Though, there are many works devoted to the present problem, for the time being a
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