Life on Miavegr
Life appeared on the planet Miavegr around 4 billions years before present.
Origin
First unicellulars (4 Gy BP)
The first organisms appeared on the surface of Miavegr after a period of strong activities of the Semor (the star). The planet had cooled down enough to have a global ocean but its magnetic field had still not stabilized. The high levels of gamma rays and UV permitted the splitting of water in hydrogen and oxygen; the strong solar wind carried out the light hydrogen while the oxygen enriched the atmosphere. The first simple organisms emerged on the first landmasses in water pools. These first organisms where made of a lipid bi-layer containing a set of auto-replicating proteins. However after the first 500 million years the Cobalt Porphyrin-Peptide Mesh (CPPM) evolved in the first oxygen-photosynthesizing organism. These polymers first evolved as part of the photosynthesis metabolism, but quickly became an effective way of encoding protein information. This gave rise to a rapid diversification of these unicellulars.
Complex cells (2 Gy BP)
Two billions years ago, Semor stabilized and Miavegr became a much more stable planet with a strong internal magnetic field. The oxygen levels continued to rise thanks to photosynthesizing lifeforms. Some of these simple cells, the Eudiktya, evolved phagocytosis and a more complex internal structure with a nucleus and organelles. Their nucleus was made of a pigment-protein capsule which blocked unwanted light to hit the CPPM. Their CPPM lost most of its enzymatic and metabolic properties, but evolved a better replication system. 200 millions years later, a drop in sunlight, due to a change in Miavegr orbit, provoked a 100 million years of global ice age. To this event only a small part of the great diversity of unicellulars survived. Three groups of simpler organisms: the Anthrachroma, Kalkapria, Subpauperia. The Anthrachroma adapted to live under the thick ice sheet and derived their energy form photosynthesis. They evolved to use what little of the light that came under the ice, absorbing even most infrared. The Kalkapria formed dense biofilm and calcareous structures near thermal seeps. The Subpauperia adapted to live in anoxic sediments in the deep ocean, they evolved a large diversity of metabolisms and some retained photosynthetic capabilities. The Eudiktya present during these times mostly fed on Anthrachroma colonies under the ice sheet.
Multicellular life (1 Gy BP)
Two billions years ago, Semor stabilized and Miavegr became a much more stable planet with a strong internal magnetic field. The oxygen levels continued to rise thanks to photosynthesizing lifeforms. Some of these simple cells, the Eudiktya, evolved phagocytosis and a more complex internal structure with a nucleus and organelles. Their nucleus was made of a pigment-protein capsule which blocked unwanted light to hit the CPPM. Their CPPM lost most of its enzymatic and metabolic properties, but evolved a better replication system. 200 millions years later, a drop in sunlight, due to a change in Miavegr orbit, provoked a 100 million years of global ice age. To this event only a small part of the great diversity of unicellulars survived. Three groups of simpler organisms: the Anthrachroma, Kalkapria, Subpauperia. The Anthrachroma adapted to live under the thick ice sheet and derived their energy form photosynthesis. They evolved to use what little of the light that came under the ice, absorbing even most infrared. The Kalkapria formed dense biofilm and calcareous structures near thermal seeps. The Subpauperia adapted to live in anoxic sediments in the deep ocean, they evolved a large diversity of metabolisms and some retained photosynthetic capabilities. The Eudiktya present during these times mostly fed on Anthrachroma colonies under the ice sheet.
