1.Well this isn't a specific homework problem, I just need a quick idea to use for a paper. Our linear algebra professor is giving us a 50 point paper project/report that has to do with the applications of linear algebra in the field of study we have chosen to pursue. I would like to do astrophysics but have not gotten high enough in physics, much less specific enough into astrophysics to know what the applications are of linear algebra in the field. Specifically, it SHOULD be something that we have already gone over in class; it's just been a pretty basic introductory class, ranging from basic matrix arithmetic, to change of bases, transformations, null/kernal/column space and eigenspace/values/vectors. It can be something we have not covered in class, but I have to prove my 'mastery' of it in the paper. If someone knows an application for it, and could briefly describe it or point me in the right direction to a web page that describes it that would be so very helpful. 2. Relevant equations: That's what I'm here for 3. I have already asked Uncle Google but he hasn't given me anything useful, so here I am in a specific community that may already know.