Respuesta :

Answer:

"The primary objective of Apollo 9 was an Earth-orbital engineering test of the first crewed lunar module, or LM. Other prime objectives included an overall checkout of launch vehicle and spacecraft systems, the crew, and procedures."-NASA website

Explanation:

Answer:

Explanation:The main idea of Apollo 9 was it was mainly just a test to see what it could do and how it would work so that Apollo 10 could go to the moon.