Multi-Purpose Logistics Module
STS-128 (ISS assembly flight 17A) was a NASA Space Shuttle mission to the International Space Station (ISS) that launched on 28 August 2009. carried the Multi-Purpose Logistics Module "Leonardo" as its primary payload. "Leonardo" contained a collection of experiments for studying the physics and chemistry of microgravity. Three spacewalks were carried out during the mission, which removed and replaced a materials processing experiment outside ESA's "Columbus" module, and returned an empty ammonia tank assembly.