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From mental_floss:
 Since 1990, the Hubble telescope
has brought us photos that are as beautiful as they are scientifically
important. But there's a limit to what Hubble can see-so space agencies
from around the world are collaborating to create a better, more
powerful, and literally bigger telescope: the James Webb Space Telescope
(JWST), which is projected to launch in 2018. In the SXSW panel "Beyond
Hubble: Building NASA's Next Great Telescope," scientists and engineers
discussed what the Webb telescope will look for and all the engineering
challenges that go into actually building the instrument.
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