This paper presents atoms and molecules incorporating hydrogen at ultra-low energy levels as a strong candidate for Dark Matter. The existence of electrons at these energy levels can be demonstrated by changing the interpretation of triplet production. The radius of this undiscovered hydrogen atom is extremely small. The radius is about 1.331×10-5 the radius of an ordinary hydrogen atom in the 1s state. If many of these atoms or molecules are collected together, a state with extremely high density will be realized. This paper predicts that, in addition to such hydrogen, diverse types of atoms and various types of molecules comprised of diverse types of atoms, can also be candidates for Dark Matter.