How the Mars Rovers Phone Home

I am sure you have seen them, those incredible pictures from Mars. I have posted many of them in this blog, including one yesterday. Did you ever wonder how these pictures were sent back to earth? Well, it turns out that although each rover has a high-gain microwave antenna that can transmit scientific data directly to Earth, they usually use a low-gain UHF antenna to transmit the data to spacecraft in orbit above Mars. There have been several previous missions to Mars that have left in...

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