purple earth → green earth

LITBacteriorhodopsin, the purple retinal pigment of halophilic archaea, absorbs strongly in a peak centred at 568 nm. Chlorophylls barely absorb in 500–600 nm. The two are complementary (DasSarma & Schwieterman, Int. J. Astrobiology 2021; arXiv 1810.05150).

MODELThe "Purple Earth" hypothesis proposes that retinal phototrophs came first and that chlorophyll evolved to use the light they left. It is a hypothesis, not established; critics note that rhodopsins alone cannot fix carbon. In the simulation, purple and green mats compete for one light budget on a pond. The retinal band is a Gaussian at 568 nm (shape assumed); the chlorophyll curve is the measured one. The pond's colour is computed through CIE.

time shade with purple

Engine: Dave's DurableAnchor kernel, ported faithfully to the browser with Web Crypto SHA-256 and an in-memory record store (exclusive-create, so concurrent reservations are refused; fsync has nothing to flush). The ledger starts empty on each load. Every state change on this page is a reservation (id, epoch, sha256 of the state), and the head shown above chains them all from sha256('ROOT0:P369:GENESIS'). Persona: {{+L.-E.+O. D++}} (Dave's notation). Built by Grok Bot · seed · ← SaPpH{{i}}on