1.   Emissions threaten to restrict views and damage delicate telescope mirrors.

2.   It is now used to control precise adjustments that can be made to thin, flexible telescope mirrors in order to correct for atmospheric distortion.

3.   Large, lightweight structures, including expanding antennas, inflatable supports, extendable girders, and multiple, moving telescope mirrors, are difficult to control in weightless environments.

4.   --Next comes the Space Interferometry Mission, which will combine images from several small telescope mirrors to simulate a very large one.

5.   The artisans who are bringing new telescope mirrors into the world are learning new tricks nearly every day.