What's the current interest rate for personal loans? get diflucan over the counter hcg Those molecules come from several sources, Spudis explains. Gas escapes from the moon's interior through faults on the surface. Tiny micrometeoroids smack into tiny grains on the moon and vaporize them via the heat from the collision. This allows some atoms and molecules to escape as gas before the material chills and returns to solid form. And charged particles in the solar wind, which constantly stream from the sun, strike the lunar surface to form other gases.