.@NASAHubble is helping to identify celestial targets for Webb. The Westerlund 2 Cluster is one example: http://go.nasa.gov/2ymo21V #JWSTpic.twitter.com/yCUt5RNfCc
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Info here: https://www.nasa.gov/feature/nasa-s-james-webb-space-telescope-to-be-launched-spring-2019 … It's a relatively short delay and is because integration is very complex, not because something is wrong.