Mars in a Minute: How Hard Is It to Land Curiosity on Mars?
Challenges of Getting to Mars: Curiosity's Seven Minutes of Terror From the top of the atmosphere to the surface of Mars is 7-minute journey. Yet it takes 14 minutes for the signal from Mars to reach Earth. So by the time NASA gets word that Curiosity has reached Mars atmosphere, the rover will have been waiting (or destroyed) for 7 minutes already.
Mars exploration since 1964, from first flyby to Curiosity - interactive | Science
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