Even if chameleon forces exist, they are extremely hard to detect. The reason for that is that those hypothetical forces are connected with all other forces. And they are like carrier waves that are putting those other forces moving. There is the possibility that the fifth force is virtual. That means it could be some well-known force that has some source or form that we don't know or we haven't seen yet. The mythic fifth force that will connect all other forces is still unreachable. The fact is that the new evidence shows that the chameleon force is a myth. And it's not even existed. We don't need chameleon force to explain dark energy. Dark energy can be something like some kind of electromagnetic "hum". There is the possibility that the cosmic hum that Voyager 1 found can be the thing that explains dark energy. When that monotonic wave motion hits plasma the energy level of the particles rises until that energy can break out from the particle. That requi...