Elon Musk: “The Earth and Mars orbits synchronize every two years or…”

“Then what are the steps, what's next step after that? Is it an Unmanned voyage to Mars. First unmanned flight to Mars. The Earth and Mars orbits synchronize every two years or every 26 months technically. So the next orbital synchronization is November of next year and you can launch plus minus a month roughly. So we'd have to launch in November or December of next year.” (27:03–27:13)

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