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What could become the most powerful telescope ever launched is one step closer to completion. The primary mirror has been assembled and was revealed to the public in late April 2016. The space telescope will have the ability to "study every phase of the history of the Universe,"according to NASA. --- Hubble vs. James Webb: Why Two Space Telescopes? | Video:
Credit: Space.com / NASA / GSFC / Edited by @SteveSpaleta
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