CONCLUDING REMARKS

A theoretical proof of the concept complemented with the pragmatic methodological approach has been established herein for converting space debris lucratively into fuels and also for building soil from silicon powder for fostering the pharmaceutical flora in the space lab of ISS for the drug discoveries. During the recycling process at the artificial gravity condition, the evolved gases could be stored in the canisters for devising thrusters for various aerospace propulsion applications. Note that, using these thrusters, the ISS could be shifted to the subsequent orbit after mitigating all space debris from the nearest surroundings. Briefly, the recycling energy conversion system proposed herein could be utilized for the possible orbital trajectory changes of space labs. Through our analytical estimation we concluded that 1 kg of aluminum debris could produce ~ 0.96-0.98 kg of aluminum powder for producing valuable fuel for chemical propulsion. Additionally, we could conclude that the silicon powder created could be used for producing feigned soil for fosteringpharmaceutical flora in the ISS to discover scarce-drugs for high-endurance health care management. It leads to say that one can aim for cultivating medicinal plants in the space lab for discovering suitable drugs for enhancing the heat capacity ratio of blood for reducing the risk of asymptomatic stroke and acute heart failure in the gravity and microgravity conditions presumably due to the variations in blood viscosity and turbulence level in the circulatory systems of human being and animals. These are succinctly reported in toto by V.R.Sanal Kumar et al. [3, 26-28]. It is known that cardiovascular risk is higher in astronauts / cosmonaut but the fundamental cause of such risk is still unknown to medical science [3, 43, 44]. Michael D. Del et al. [43] highlighted that Apollo lunar astronauts exhibit higher cardiovascular disease mortality. It is important to note that the world-wide space agencies and nations are contemplating for the extended manned missions to Mars and theMoon . In such manned missions, health risks could be escalated as travel goes beyond the Earth’s protective magnetosphere into the more intense deep space radiation environment. Therefore, suitable drug discovery is inevitable for increasing the thermal tolerance level [3, 28] for reducing the cardiovascular risk of the inhabitants (human being / animal) of the space vehicle or space lab. Clare Wilson [44] reported (2019) that being in microgravity can have strange effects on the body, including people’s blood flow backwards. K. Marshall-Goebe [45] reported that exposure to a weightless environment during space flight results in a chronic headward blood and tissue fluid shift compared with the upright posture on Earth, with unknown consequences to cerebral venous out flow. All these findings lead to say that high endurance health care management is required for reducing the risk of cardiovascular disease mortality of astronauts / cosmonaut for conducting experiments in the space labs. Further discussion on the medical application of our study is beyond the scope of this short communication.
Briefly, our theoretical concept study will create a win-win situation through real time experiments in the orbiting space lab by recycling the space debris lucratively, for creating end products for the benefits to humanity. We concluded that the proof of the theoretical concept presented herein could be implemented in real-time in any space lab for the debris mitigation and recycling in accordance with the procedural requirements set for meeting the safety and mission assurance [46-50]. Note that additional materials (fuel/oxidizer) and/or additives must be available on board for making solid propellants for getting desirable specific impulse, as the case may be. Additionally, sufficient water must be produced using on-board fuel-cell for vegetation. These are identified as minor limitations in making the desirable end product without any prerequisite. Nevertheless, barring all limitations, we concluded that the space debris-recycling and the energy conversion system described methodologically herein are viable options for producing the end products in the ISS for various biological and aerospace applications in the future for the benefits to humanity.