Answer To Celebrity Scramble...
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No best answer has yet been selected by curragh. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.www.mit.edu has started their open learning stuff, but is very thin on the ground for space stuff.
I find that for physics and astronomy the Answerbank has quite a few very good posters.
For space and that kind of stuff, put 'edu' or 'ac uk' in your search, will throw up universities, which often have lots of good stuff available for public access.
It's all relative though.
http://www.newscientistspace.com/article/dn7387
Sorry, couldn't help but laugh. Millions of dollars, huge obstacles to overcome (gravity trajectory calculations, airbags, thrust recalculations, object AI collision detection, the best telemetry ever)......gets stuck in sand. Hope he's got MAA cover..