It's radio waves. I'm not sure what other transport layers you are expecting to use between Earth and Mars. The latency is measured in minutes. Obviously som

It's radio waves. I'm not sure what other transport layers you are expecting to use between Earth and Mars. The latency is measured in minutes. Obviously something like TCP won't work. Typically they would use something like DTN. https://www.nasa.gov/directorates/heo/scan/engineering/technology/disruption_tolerant_networking https://www.nasa.gov/directorates/heo/scan/engineering/techn... Edit: Corrected hours to minutes. Brainfart on my part.