Read the excerpt from the passage Moon Mission. NASA sees Gateway as a base for staging missions beyond the moon. What’s the next stop? Mars. The space agency plans to build a special craft for the trip. The Deep Space Transport will carry astronauts from Gateway to the Red Planet and back. This will reduce the enormous cost of shuttling supplies for a Mars mission all the way from Earth. The Mars transport could even expand its size by attaching one of Gateway’s habitat modules.

Which statement is a central idea supported by the details in the excerpt?