Four and a half billion years ago, all of the matter of the solar system, including us, was part of a giant molecular cloud. Genesis is providing the chemical composition of that solar nebula. ...The material is still stored for us in the surface of the sun.
The really fun part of it is discovering actual answers about what solar composition is.
Once it gets there it opens up two covers and deploys high purity materials which are then used to collect the solar wind one atom at a time.