Everyone has a nationality. This means you are a citizen of a nation or country, the country where you come from. That nationality is written in a passport, and that passport gives you the freedom to travel to other countries. When you travel, you receive stamps in your passport from the places you have visited.
All of us are also citizens of Earth, the planet where we come from. Make yourself a Solar System passport in this fun activity.
A template for a passport in English and Portuguese follows the guide.