How do planetary rovers send signals back to Earth?

26 March 2006

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Question

If it takes huge dishes to send signals into space, how do things like Venus or Mars rovers send their signals back when they send us their data?

Answer

The reason why we use huge dishes is because the space probes use small dishes that send weak signals. They are even weaker by the time they get here, so we have to have big radar dishes to hear them.

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