منابع مشابه
Mars before the Space Age
Mars has surely been scrutinised since the dawn of humankind. Its appearance every couple of years like a drop of blood in the sky led to warlike attributes in the ancient world. In the 16th century Tycho Brahe made accurate observations of the position of Mars that enabled Johannes Kepler to obtain his first two laws of planetary motion. These in turn were explained by Newton’s laws of motion ...
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The effects of the space radiation environment on spacecraft systems and instruments are significant design considerations for space missions. Astronaut exposure is a serious concern for manned missions. In order to meet these challenges and have reliable, cost-effective designs, the radiation environment must be understood and accurately modeled. The nature of the environment varies greatly be...
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As a member of the United Nations Committee on the Peaceful Uses of Outer Space (COPUOS), Iran has a long-term space exploration program. Space radiation is one of the challenges facing humans when they go outside Earth's protective atmosphere and magnetic field. Space is an environment that the cardinal principles of radiation protection i.e. time, distance and shielding cannot be effectively ...
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This paper describes the development of CRMFLX, an ion model for the outer magnetosphere developed for scheduling periods when the Advanced CCD Imaging Spectrometer (ACIS) instrument onboard the Chandra X-ray Observatory can be safely moved into the focal plane position required for science observations. Because exposure to protons with energies of approximately 100 keV to 200 keV has been show...
متن کاملAlice in the Space Age
on the ivy with the other arm. He reached the ground, lifted her on to his horse, mounted it himself and galloped away. Presently they reached a wood. He pulled up the horse, tied it to one of the trees and helped the princess down on to the grass beneath. He knelt down beside her and, terrified, she looked up into his eyes and said 'What are you going to do to me?' The knight replied 'That, my...
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ژورنال
عنوان ژورنال: Astronomy & Geophysics
سال: 2017
ISSN: 1366-8781,1468-4004
DOI: 10.1093/astrogeo/atx056