Have you ever visited the Earth?

I hear it is much different from life here on Mars. First of all, Earth has distinct colonies separated by mive bodies of seawater. The most prominent of these colonies is called the "United States", or "US" for short. An organization devoted to space exploration based in the "US", called "NASA", has been sending us cryptic messages with their primitive technology. Be careful not to get too close to the Earth's atmosphere or the Earth dwellers will clify your spacecraft as a "UFO" and will detain you in a secret military base somewhere in the Midwest region of the "United States".