The Thirty Meter Telescope is one of two extremely large ground based telescopes under development by university consortia that are expected to fill a gap between James Webb Space Telescope and its eventual successor. However, astronomers who are not part of the consortia won’t be able to use them. Credit: TMT International Observatory
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A custom cargo container holding JWST’s optical telescope assembly is loaded into a C-5 aircraft in Houston on Jan. 31 for transport to Northrop Grumman’s Redondo Beach, California, facility. Credit: NASA Johnson Space Center
WFIRST
Between 1993 and 2009, astronauts repaired and upgraded Hubble five times. (Credit: NASA)
NASA’s James Webb Space Telescope emerged from Chamber A at NASA’s Johnson Space Center in December.  (Credit: NASA/Chris Gunn)
James Webb Telescope