Launch cost is actually a _significant_ fraction. Even more so, because a lot of the complexity arises from design and systems to get things right on the first

Launch cost is actually a _significant_ fraction. Even more so, because a lot of the complexity arises from design and systems to get things right on the first try, since launch costs are so prohibitive. Put another way, if launch costs were cheaper, it would also have been cheaper to design and build the telescope.