The United States has proven beyond doubt that they are the world leader in the space race. We have been to Mars multiple times and are likely headed back to the moon in 2024. That is not to say however that we are the only players in the game. China and Russia have both been to the moon multiple times and have decided to work together on a new International Lunar Research Station which may or may not share space with other countries. It is an exciting time for those interested in space travel and you can learn more about this interesting project HERE.