The no-boundary proposal implies that the universe is completely self-contained and not affected by anything outside itself. It is not created or destroyed, it just IS... The universe would be completely unified and smooth in the very early stages, but would develop irregularities as it expanded. The no-boundary proposal predicts that the universe would start in a smooth and ordered state and would become more disordered and irregular as it expanded.
Book Name: A Brief History of Time Author: Stephen Hawking