Space law is a rapidly developing branch of public international law . As a matter of fact, states are developing themselves in space activities day by day, and even private companies are envolving to this activities . As a possible result of this situation, certain controversies arise within the scope of the rules prevailing in space law . Some of these discussions have important consequences in the context of the international regime of state responsibility . Especially with the fact that private companies have started to take an active part, the rules of state responsibility have become the sub-ject of different discussions . In this article, the first part will provide general infor-mation about the history and conventions of space law . Following this, the impor-tance and definition of the concept of ’launching state’ will be discussed . In addition, the rule of state responsibility that dominates the space law will be explained in the Space Treaty . Then the ‘obligation’ regime in space law will be considered within the scope of the concept of the launching state and the Liability Treaty . Finally, the Turksat-5B satellite of Turkey will be evaluated both within the context of the launc-hing state and the probable responsibility and liability regime in the context of the states involved in the launch process of Turksat-5B into space.