HackerTube / Video
Turning Earth Into a Telescope | The Terrascope
Cool Worlds

David Kipping presents his proposed Terrascope, a telescope that uses Earth's atmosphere as a lens to achieve enormous magnification. He covers the history of telescopes and his path to the idea, plus Sol-scope and Jupiter-scope variants.
HN people point to it as an excellent explanation of using Earth's atmosphere or gravity as a lens in astronomy threads.
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