Don't worry, JWST isn't going to burn up for a few billion years. Until the Sun expands into a red giant at least.
They are sending it to the L2 lagrange point which is further out that the moon. That's also why they are so careful about making sure the origami sun shield works right the first time. If it screws up the whole mission is lost because there's no chance to fly some astronauts out there to fix it like we did with Hubble.
As for exposures while its spinning, I was under the impression these are really long exposures and require it to be precisely aimed for quite awhile.
> why they are so careful about making sure the origami sun shield works right
They cannot really test it on Earth, as it must work in free-fall. Given the past problems with unfolding these things, I have a horrible suspicion that it won't work, and we won't be able get to L2 to fix it.
They are sending it to the L2 lagrange point which is further out that the moon. That's also why they are so careful about making sure the origami sun shield works right the first time. If it screws up the whole mission is lost because there's no chance to fly some astronauts out there to fix it like we did with Hubble.
As for exposures while its spinning, I was under the impression these are really long exposures and require it to be precisely aimed for quite awhile.