Take a look at John Carmack's Armadillo Aerospace work, or at XCOR aerospace. Design a better pump. Build a VTVL hopper. Work on a GPS that will work at high a

Take a look at John Carmack's Armadillo Aerospace work, or at XCOR aerospace. Design a better pump. Build a VTVL hopper. Work on a GPS that will work at high altitude / high acceleration. There's a whole group of new-space companies out there. Solve one of their pain-points.