Suppose you want to give your address to a friend you have on the planet Mars
Answers
If you want to give your address to a person who lives on Mars, then you would inform him/her to visit the planet which is third towards sun in the solar system.
The planet is next to your planet and has one satellite Moon in its orbit.
Explanation:
If I were to give my address to a friend of mine on planet Mars, I have to go through all the latest scientific ways possible. This may involve the messages sent by the Earth to other planets in the form of radio waves. This was rather easy as we're just a few light-years away from the universe. Other new techniques might involve the famous, 'Golden Records'. This is the way the scientists use to locate our position to be known by the foreign person (aliens) of any other planet, such that we can make contact with them.