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Re:The Earth-Twin Planet That Nobody Talks About by twic on Sunday October 18, 2015 @06:36PM (#10410133)
You wouldn't have to land. The Soviets sent a couple of balloons:

https://en.wikipedia.org/wiki/Vega_program

And Geoffrey Landis proposed sending a solar-powered drone:

http://media.cleveland.com/science_impact/other/Landis%20Ven...

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