Apollo 9 was a test mission in Earth orbit, focusing on the Lunar Module (LM) and the Command and Service Module (CSM). It was a crucial step towards the moon landing, but it did not actually go to the moon.

Here's why:

* Testing the LM: The mission's primary goal was to test the LM's systems in a simulated lunar environment. This included docking with the CSM, deploying the LM's landing legs, and conducting a simulated descent and landing sequence.

* Testing the CSM: Apollo 9 also tested the CSM's capabilities, including its maneuvering and navigation systems.

Apollo 11 was the first mission to successfully land on the moon.