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SpaceX CEO Elon Musk got a rock-star reception last September at the International Astronautical Congress in Mexico when he unveiled his long-promised plan to send scads of settlers to Mars. Now he’s working on a reprise, and it just might be announced at this September’s IAC meeting in Australia. Musk dropped the hint overnight when a follower asked him on Twitter to say when he’d unveil Version 2.0 of the plan, which is supposed to explain in more detail how all those Mars missions be paid for. “Maybe the upcoming IAC in Adelaide,” he replied. For now, Musk isn’t on the schedule, but that could change. Besides, Musk might want to check in on the 100-megawatt battery system that Tesla is due to install about 130 miles north of Adelaide during the same time frame.

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