Hi! I need help with the method to approach a question, if I wish to calculate how long it will take for a radio message to reach a certain planet (just the general concept), what will be the key pieces of information I require?(adsbygoogle = window.adsbygoogle || []).push({});

I know I need: the distance from Earth to said planet

the distance travelled by the radio message (speed of light x journey time)

What else would I require? Any help is appreciated on this question. Thank you.

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# Calculating speeds of radio to a planet

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