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Message: [QUOTE="SVCBeercats, post: 2814543, member: 7874"] Question 25 seemed like a repeat of question 13 - like an echo. Which made me "reflect" on Echo I. Why the name unless its purpose was to simply reflect signals back to Earth, not unlike meteor burst communication which the USGS uses to send data to a data collection station inexpensively using simplex transmission. Meteors of varying sizes are always entering our atmosphere creating an ionized vapor trail which is excellent for bouncing radio signals back to earth for reception. Meteor burst communications is cheap but not real reliable mind you. Ergo they use simplex transmission with a repetitive transmission of the same data. [/QUOTE]