Science is wholly engaged in exploring the supernatural. Just because a phenomena occurs regularly and is capable of human, or scientific, explanation does not nullify the nature of creation as it stands.
Does unknown = supernatural?
Ghostbusters.
Everything is supernatural. Calling it otherwise does not change it. Taking the supernatural and calling it natural does not change its nature, and more than calling something true makes it true. The terms "supernatural" and "natural" are arbitrary terms based on human comprehension.
The "natural" course of the universe is to disintegrate into nothing. The elements down to all that is known about them will lose their cohesiveness if supernatural forces are withdrawn from all material entities.