Milan Ćirković of the Astronomical Observatory of Belgrade, and one of the world’s leading authorities on astrobiology and the evolution of galaxies and baryonic dark matter, has outlined along with philosopher Robert Bradbury the six great mega-trajectories of the biological evolution on Earth:
1. From the origin of life to the ”Last Common Ancestor”
2. Prokaryote diversification
3. Unicellular eukaryote diversification
5. Invasion of the land
6. Appearance of intelligence and technology.
The authors suggest a “postbiological” seventh mega-trajectory triggered by the emergence of artificial intelligence “at least equivalent to the biologically-evolved one. (Bradbury is the inventor of the matrioshka brain -a hypothetical megastructure, based on the Dyson sphere, of immense computational capacity).