No reason you couldn’t, but current propulsion tech is what limits us to traveling on our “solar plane”. If we had some high powered/efficient energy source that wasn’t liquid/gas propellant based you could go any direction you wanted, you just need to counteract the inertia you already have.
This is also the reason why its actually super energy heavy and sort of counter intuitive to send something to the sun. We are moving pretty fast in orbit and you need to to slow down for gravity to “pull you in”.
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