which involves taking images at different points in the satellite orbit and then combining them to detect sub-centimetre-scale height differences on the Earth surface.
and the ability to fabricate space system components on-orbit instead of building them on the ground,
##3-D printing and robotic construction of components on-orbit would allow a smaller, less expensive launch rocket that will##improve performance per cost by orders of magnitude,
##But##on-orbit fabrication with Spiderfab,##a TUI presentation#promises,##will enable NASA to accomplish ten times more science per dollar.##
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