Within the Marvel Universe, the species Homo sapiens, and its genus Homo, are far more prolific and active than in the real world. The branching of the species Homo sapiens came with the arrival of the Celestials on Earth. Space gods of genetic engineering, the origin of the Celestials as a race is shrouded in mystery. They are beings of phenomenal cosmic power and knowledge and are known to visit planets across the universe. They work to enhance the local sentient fauna and return periodically to monitor the progress of their charges.