According to young Earth creationism, which takes a literal view of the book of Genesis, the universe and all forms of life on Earth were created directly by God sometime between 5,700 and 10,000 years ago. This assertion is contradicted by radiocarbon dating of fossils, as well as modern understanding of genetics, evolution, and cosmology.[47] For instance, astrophysical evidence suggests that the universe is approximately 13.8 billion years old.[48] Moreover, 10,000 years is not enough time to account for the current amount of genetic variation in humans. If all humans were descended from two individuals that lived less than 10,000 years ago, it would require an impossibly high rate of mutation to reach humanity's current level of genetic diversity [clarification needed].[49]