Ask Ethan: Why Don't We Build A Telescope Without Mirrors Or Lenses?

Today, we have advanced CCD sensors that can take advantage of every single incoming photon. So why do we still build telescope mirrors?

from Forbes Real Time https://www.forbes.com/sites/startswithabang/2017/09/30/ask-ethan-why-dont-we-build-a-telescope-without-mirrors-or-lenses/
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