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One year after Elon Musk unveiled his grand plans to send humans to Mars, the SpaceX CEO is ready to make some refinements. Musk is returning to the same annual space conference where he made that original announcement, the International Astronautical Congress, to detail the new version of those plans. His speech starts tonight at 12:30AM ET (September 29th), and you can watch it above (or right here on YouTube).

We already know Musk’s revamped solar system colonization plan will now include a focus on the Moon, because earlier this evening he posted a rendering of a SpaceX Moon base on Instagram. The photo shows two of the company’s futuristic Mars Colonial Transporters sitting on the surface of the Moon with the Earth in the…

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