Or it could mean that Mars is simply orbiting around the Sun.
Ok, so Mars orbits the sun. How do you know? Maybe Mars is the center of the universe and we orbit the sun which orbits Mars. How would you differentiate between these two options?
Some scientific articles or a book, or something.
Do you think it would be hard to find any article which says the Earth orbits the sun? We could go all the way back to Copernicus and find references to that phenomenon. However, curiously, whenever people post those things, you refuse the acknowledge their relevance or strength. So, again, what would you like to see in those articles that would make you consider the possibility of your being wrong. What would those articles have to say?