... Cool" gas may form and strengthen sunspots . Scientists think that molecular hydrogen plays an important role in the formation and evolution of sunspots. ... They form hydrogen molecules that take half the volume of the atoms, thus dropping pressure and concentrating the magnetic field. ... From that, they calculated the H 2 concentrations. т??We found evidence that significant quantities of hydrogen molecules form in sunspots that are able to maintain magnetic fields stronger than 2,500 Gauss,т?? ...