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Phacelia tanacetifolia is a species of flowering plant in the borage family Boraginaceae, known by the common names lacy phacelia, tansy-leaf phacelia, blue tansy, purple tansy or fiddleneck (UK).
The Purple Earth hypothesis has great implications for the search for extraterrestrial life. Historically, planets reflecting light in the green-yellow range were sought out as possible hosts to photosynthetic organisms, due to the implied presence of chlorophyll.