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Originally Posted by FlamesAddiction
There are things that can wrong of course as there is some uncertainty. The biggest one for me is there is no way of knowing how many small rocks ranging in size from grains of sand to baseballs are flying around in that L2 area. We simply have o information on that and it is possible that as soon as the satellite gets into that area, it gets shredded. All we can do is wait and see what happens. People think space is just an empty vacuum in between celestial objects, but there is a lot of debris out there. In fact, NASA took this into consideration and assumes that it will get hit be objects occasionally. They reinforced the heat shield to account for this, but there is only so much you can do when the weight has to be kept at a minimum. Or that area of space might be fairly empty and there is no danger at all. It is practically impossible to predict.
For the most part though, I don't think there are a lot of unknowns. They learned a lot from the successes and failures of Hubble, and this isn't really different. It is more complicated, but is essential still just sticking a satellite into space. Most variables can be anticipated and planned for.
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As SebC said, L2 isn't a stable lagrange point so there's nothing likely to be hanging out there. This is also not the first visit to L2, there have been satellites before that have operated before with no issue.