Yes of course. The visible light spectrum is just a fraction of what actually exists in the EM spectrum — first of all.

There are also other dimensions, possible parallel universes and other phenomena that we haven’t studied or fully understood yet.

The thing is to gather as much evidence as possible. Materialism is based on logically intuitive ideas based on observations that things work mechanistically . However the deeper we probe into existence the more the make up of reality is much stranger than we’ve imagined.

If it has a physical dimension, some form of matter or can be directly observed it is part of our reality.

Nothing is really beyond our understanding—though— as long as we can observe it, gather evidence for it and model it with conclusive proof.