OPA (Outer Planets Alliance)

The Outer Planets Alliance (OPA) is a fictional, nomadic organization in the "Expanse" series, representing various inhabitants of the outer planets and moons. They advocate for the rights and independence of those living beyond Earth and Mars, often opposing powerful political entities. The OPA functions as a loose coalition, engaging in activism, resistance, and sometimes militant actions to protect their communities and challenge systemic inequalities. Their goal is to ensure the welfare and autonomy of the people in the outer solar system, making them both a political and social force within the series’ universe.