Video source is acedemic science there are so many gaps in our knowledge of the sun we have mapped practically every square mile of the planet mars we know more about mars than the surface of the earth in fact but the sun constantly changes its not made out of a solid surface at all its made out of plasma roughly 75 percent hydrogen and 25 percent helium Thats why this probe is so important because it will travel inside the orbit of mercury where no other space probe has gone before dr kaku