What government branch appoints Supreme Court justices?
Supreme Justices are nominated by the Senate.Then, the President appoints the justices. Therefore,the executive branch appoints supreme court justices
The President. Remember, the President appoints the Supreme Court Justices. Also, the President is part of the Executive Branch of the Government, and supervises the Judicial Branch of the Government (in which the Supreme Court is a part of, thus subsequently the Court Justices are a part of it as well).
This Power is split between two branches. Neither can act without the other in terms of Supreme Court Justices. When a Supreme Court Justice either retires;, steps down;, becomes ineligible for public office;, or dies, the President (Executive Branch) has the authority to nominate a potential replacement. However, the President does not have the power to confirm the appointment. That Power lies with the Legislative Branch, specifically, the Senate.
The nine US Supreme Court justices belong to the Judicial Branch of government; however, it would be inaccurate to say this branch is "made up of" the nine justices, as that implies the Supreme Court is the only entity within the Judicial branch. The entire federal court system is also part of the Judicial branch.