Hey,

That depends. Do you want to become a professional physicist? Get a degree in physics and mathematics, then get your Ph.D. in physics. Aerospace engineering alone will not prepare you for a physics Ph.D.

Do you want to make a lot of money doing a physics-like thing? Get your degree in aerospace engineering or, if you really like money (because aerospace engineers aren’t paid as highly as, say, chemical engineers), do aerospace engineering and applied mathematics.* That way you’ll have data science and/or quantitative finance as career options too.

Hope I solve your query.

All the best!!!!