I'm recently interested in astronomy/astrophysics in a double major with a humanity, but I'm a junior--my ECs don't add up for the Stem side. Would that hurt my application?
I don't think it would! Changing your mind is absolutely fine and normal!
But you might want to explain somewhere on your application how and why you changed your mind.
+ you're a junior, so you still have plenty of time to start a new EC that matches your future plans!
Hope this helps :)
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