How many Supreme Court Justices are there?

There are nine Supreme Court Justices on the Supreme Court of the United States. These nine Supreme Court Justices who serve on the Supreme Court of the United States are only able to ascend to the Supreme Court of the United States after being nominated by the President of the United States, undergoing a hearing held by the Judiciary Committee of the United States Senate, and receiving a majority vote in their favor on the floor of the full Senate.

The nine Supreme Court Justices on the Supreme Court of the United States are the final arbiters on whether or not a law passed by the legislative branch is constitutional. The ability of the nine Supreme Court Justices to conduct judicial review of an act passed by the legislature was established under 1803 sitting of the Supreme Court of the United States of America, under which the Marshall Court interpreted the Constitution to grant the Supreme Court of the United States the Constitutional authority and responsibility to address whether or not the cases presented to it were in accord with the Constitution of the United States of America. The case which enshrined this principle was the case Marburry v. Madison.