The Last 3 of the Webb Telescope Flight Primary Mirror Segments (image) NASA/Goddard Space Flight Center Share Print E-Mail Caption The last three of the 18 flight primary mirror segments arrived at NASA's Goddard Space Flight Center in Greenbelt, Md., on Dec. 16, 2013. After traveling across the country, the mirrors were prepped to enter a Goddard clean room for inspections. Credit NASA Goddard/Chris Gunn Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.