Science Questions

Sun, 26th Mar 2006

Part of the show Naked Science Questions and Answers

Question

Jitten via email asked:

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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