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Griffin clarifies his remarks
Griffin acknowledged that he believes "we have been restricted to low-Earth orbit for far too long and that the proper focus of our nation's space program should be the exploration of the solar system."
But he added, "We must complete the station and the only tool with which we can accomplish that is the shuttle."
"At this point, an expeditious but orderly phase-out of the shuttle program, using it to complete the assembly of the station while we develop a new system, is the best thing that we can do for our agency and the nation," he said.
Originally posted by resistance
The white, shiny suits will reflect back some of that heat, but whatever is not reflected back as light will stay as heat, and it will just keep accumulating, because a vacuum is a perfect insulator, and the astroNOTs are in a perfect vacuum.
Originally posted by Hal9000
Originally posted by resistance
The white, shiny suits will reflect back some of that heat, but whatever is not reflected back as light will stay as heat, and it will just keep accumulating, because a vacuum is a perfect insulator, and the astroNOTs are in a perfect vacuum.
As you stated there are different types of heat transfer, and heat transfers by radiation through a vacuum. So in a vacuum, when something heats up, it also starts to radiate heat from it's self to cool down. It does not keep getting hotter. The temperature of an object depends on the intensity of the radiation and the mass that is absorbing it. But the mass also gives off the heat until a balance is reached and does not get any hotter. When there is no more radiation striking the mass, the mass continues to radiate heat and cools off. Hope that helps.
en.wikipedia.org...
Originally posted by resistance
But with none of the heat being diffused by an atomosphere but, rather, being kept in by the vacuum that we call "atmosphere" on the moon, I'm still not just taking anybody's word for this 250 degree temperature. I'd like to know where this figure came from and how.
Originally posted by Hal9000
Originally posted by resistance
But with none of the heat being diffused by an atomosphere but, rather, being kept in by the vacuum that we call "atmosphere" on the moon, I'm still not just taking anybody's word for this 250 degree temperature. I'd like to know where this figure came from and how.
I can't speak for how the temperature was determined, but the vacuum doesn't keep the heat from transferring (heating up or cooling down). It is radiated by electromagnetic waves, much like radio waves and does not need an atmospheric medium to transfer. That would be Convection heat transfer, one of three ways heat transfers. The other two are Conduction and Radiation.
en.wikipedia.org...
Originally posted by Astronomer68
The real mistake was Kennedy's in getting the Govt. involved in setting design & engineering goals for space vehicles. The problem wasn't so much that NASA was created and became the "GOD" of the aerospace industry as it was that all the aerospace companies tried to feed from the Govt. hog trough without presenting alternatives to what the biggies got NASA to endorse. The space program lost all its vision and competiveness because the govt. took it over.
Coincidence the moon missions died under Nixon (Bonesman)?