Why is the James Webb telescope so expensive?
That's why JWST is so expensive. Because we've spent two decades building and testing every single piece a million ways to do everything to make sure it doesn't have problems
How far can James Webb see?
With its gold mirrors, JWST should be able to see the infrared light from galaxies that are up to 13.6 billion light-years away from Earth . And that's what makes the telescope a window into the past. Light from objects 13.6 billion light-years away will have taken that many years to reach the telescope's mirror.
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