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I was watching the egress early this AM and heard an interesting milestone mentioned; today will be the first day of international communications on another planet. The European Space Agency's Mars Express & NASA's Spirit will link up for a flyover chat.
The way they explained it, Spirit will be able to better analyze a few ground experiments by having a grasp on the chunk of atmosphere between it & Mars Express during the experiments. Cool of Google to give them all a pat on the back.