On Sun, Aug 26, 2012 at 5:59 PM,  <[email protected]> wrote:

> Was something left in orbit to relay radio
> signals?

Yes, Odyssey:

"Odyssey and Curiosity
Odyssey now acts as a relay for UHF radio signals from the Mars
Science Laboratory rover Curiosity [9]. Several days before the MSL's
landing in August 2012, Odyssey's orbit was altered to ensure that it
would be able to capture signals from the rover during its first few
minutes on the Martian surface[10]."

http://en.wikipedia.org/wiki/2001_Mars_Odyssey

All Curiosity parts are on the surface.

T

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