I think this would be a great idea in the future, not only include every planet in the solar system but include all the moons Mars has two and Jupiter, Saturn and Neptune have dozens imagine all the immense gameplay and story that could arise from using every moon and it's their right for binge to do there's so many moons destiny doesn't have to worry about leave the solar system for a while.
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Good idea, I think some of the moons should be used for PvP maps only though because all those moons would take a lot to make especially for PvE.