Starting from Earth, which of these do you think requires the most energy to reach?
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Stable orbit not required. Mercury is the only one you need to orbit, highly elliptical (but not parabolic) is fine.
One important note is that I said "energy", not "delta-v". You can technically reach "an orbit" by crashing into the surface, but that doesn't change the energy involved, just changes the source from chemical thrusters to the planet's inertia
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hmm, but if you're counting potential energy changes as part of it then all answers are equivalent, no? If you're counting potential energy lost from the spaceship-sun gravitational system then you also have to count potential energy gained
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Oh wait you said planet's inertia, not planet's potential energy, my bad
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