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The moon is 380,000km away and a laser will spread out considerably even over a small distance. I remember reading about some flat earth morons who tried to prove the earth was flat by measuring how far the point from a laser pointer was from the water on two boards a couple of kilometres from each other on a lake - they found the laser had spread out so ...


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Any time there is a question about temperature in space I think it's worth saying a little about what that measurement even means. The temperature always has to be the temperature of something. Here on earth, when a weather report gives "the temperature", it's the temperature of the air. The temperature of the ground nearby can be higher or lower ...


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Launch Vehicle Digital Computer (in the Saturn V instrument ring) The astronaut Commander monitors several sources of information during ascent. He is trained to abort on two separate but related abort cues. He may use his own physiological senses. He may be instructed by verbal commands from Mission Control. The ABORT light is a cue that can be turned on ...


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Using some very basic values we can get a crude approximation. With a diameter of $3.7\ m$ and an expansion ratio of $16$ we can infer that the throat area is around $\frac{\frac{\pi}{4}*3.7^2}{16}\approx 0.672\ m^2$. The characteristic length, $L^*$, of an engine is defined as follows: $ L^* = \frac{V_c}{A_t}$ with $V_c$ the chamber volume and $A_t$ the ...


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