خبايا مشروع أبولو وخدعة الوصول للقمر

Quote: While most of us might not have guessed we would not return to the moon after our last landing in 1972 until perhaps 2020, we should have guessed that human space exploration is inordinately costly and far more dangerous than we were led to believe by the initial successes of the Apollo missions. Although fuel costs are another reason why it is so much cheaper to send unmanned missions into space, the chief obstacle against human travel to Mars is simply cosmic radiation. During the 18 months or so to do the round trip journey a lethal dose of radiation is likely to be received.