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If mars is on the other side of the sun, it would be a while before it swings back around. I think?
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Either of you play Kerbal Space Program? That's where I learned all my orbital mechanics. But the answer is yes the planets need to be aligned, but mainly as a fuel saving maneuver to reach the planet with least energy expenditure
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No, that looks pretty cool, though.
The first season of The Expanse did a great job of portraying orbital mechanics.
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