Earth's atmosphere refracts distant starlight into a focal line starting near the Moon's orbit, and a small detector at the Earth's Hill radius could achieve photon-collecting amplifications of tens of thousands.
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The "Terrascope": On the Possibility of Using the Earth as an Atmospheric Lens
Earth's atmosphere refracts distant starlight into a focal line starting near the Moon's orbit, and a small detector at the Earth's Hill radius could achieve photon-collecting amplifications of tens of thousands.