<p>Can you switch to aerospace like that? Will it be harder to get admitted to top notch grad schools if they see that I don't have a bs in aerospace?</p>
<p>Yes. I actually know a big handful of aerospace phd students right now that did not get an aerospace bs (and not all were mech.e’s - I know one systems engineer).</p>
<p>I am doing that right now.</p>
<p>I know Aerospace PhD students with undergrad degrees in Math, Physics, Electrical, Mechanical, etc. You do not need an Aero BS to go for an Aero PhD.</p>