1951- 520 aerospaceengineering astronomy biography congresses cosmology designandconstruction evolution exploration extraterrestrialenvironment galaxies history hubble-weltraumteleskop instruments kathy maintenanceandrepairhubblespacetelescope(spacecraft) orbitingastronomicalobservatories outerspace quasars redshift spaceastronomy spacecraft spaceoptics spacetelescopes sullivan telescopes unitedstates womenastronauts womenscientists