The black numbers are the antenna ratings of a single antenna (as shown in the part descriptions in the game): 5k = no antenna (integrated in Pod/Probe cores) 500k = communotron 16 or 16-S .... 100G = communotron 88-88 or RA-100 So black numbers show the range of a single antenna.   You can extend your range by using more than one antenna on your craft. This is shown by the gray numbers, and they are related to the last black number.   Example: Y
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