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The Space Shuttle has been criticized as being a white elephant since before its first launch. Modern astronautical engineers agree. They have managed to get NASA to retire the Shuttle in 2010 and replace it with a mix of smaller, high-performance space planes for taking people into space, and robotic "big dumb heavy lifters" for moving material, a plan which would save money and improve our ability to work in space.
What's the push, then, to abolish NASA?
The human risk factor is also a moot point. It was more dangerous to try to break the sound barrier in the 1940s than it is today to go into space. IIRC, several pilots died trying to break the sound barrier before Chuck Yeager finally did it. These pilots knew the risks, and took them anyway.
Our military excursion in Iraq has already cost us $300 billion. That's enough money to fund NASA at current levels for 20 years. And "corrections" costs us $80 billion per year, which is enough for at least four years of space exploration. So it can't be money.
The orbiting sunshade idea, as a way to reduce global warming, is impractical. Warming is happening because of the dynamic action of greehouse gasses on heat loss, not the amount of insolation. Using such a satellite to control the weather would be a lot more expensive than you think, too. The shield would have to be several thousand square miles in size -- at a minimum.
Besides, check out the author of the orbiting sunshade scheme. It's Edward Teller; he proposed it in the middle or late 1990s. He did all right building the first atom bombs, but his ideas in the last few decades have been just a bit wacky. One proposal of his gave rise to the idea of "Chemtrails". Teller has also consistently supported pre-emptive nuclear strikes against any political group that has displeased the Right Wing.
We ought to re-think our spsce program, but mainly, to avoid the bureaucratic stupidity that has plagued it so often. Development of space is a logical, natural, environment-sparing evolution in human industry. Why go backward?
--p!
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