The Joint Dark Energy Mission (JDEM) was an Einstein probe that planned to focus on investigating dark energy.
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This would be a 1.5-metre telescope with a 144-megapixel HgCdTe focal plane array, located at the L2 Lagrange point; the expected cost is around $1.6 billion.
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The Dark Energy Space Telescope (Destiny), was a planned project by NASA and DOE, designed to perform precision measurements of the universe to provide an understanding of dark energy.
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