Finish up your undergrad in engineering strong. Take as many physics classes as you can on top of the engineering courses.
Find colleges for grad doing work in areas of interest and see if you can get summer research work there as an undergrad next summer if you can’t find something with NASA or other subcontractors working on related tech. Look here for next summer:
https://www.nasa.gov/careers/students-and-recent-graduates-old
Dig into the research going on at campuses for grad school and make sure it is a fit for your interests. Reach out to professors in their grad programs and talk to them.