Those planets would not make any sense to be included - they are gas planets, there is most likely nothing to land on (and if there was, you wouldn't be able to see anything anyways and there is absolutely nothing able to live or withstand their atmosphere). Best theories right now point to a (relatively to the overall diameter) very small MOLTEN core. Not a solid chunk of rock. Atmospheric wind speeds upwards of 1000km/hour.
Mars, the Moon and Venus all make sense scientifically (Venus could theoretically be turned into a much more hospitable planet than it is currently, and Mars once had an atmosphere which allowed liquid water on its surface, and the Moon has no atmosphere at all so as long as you are protected from the solar radiation and have an oxygen supply, you're fine). The Jovian planets do not make sense at all.
Getting some of their moons, though... That would be epic. Imagine standing on Titan and getting a 'Saturn Rise?' Amazing.
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mercury is a vex planet and i mean that literally the vex turned it into a machine u get teleported there (NOT ONE OF ITS MOONS) during the black garden mission and dinklebob even states that the vex turned the planet into a machine