Elon Musk’s spaceflight company is continuing its work on the vehicle that could one day take people to the moon and eventually Mars.

SpaceX will launch Starship for a seventh test flight on Wednesday, an experiment that will feature the spacecraft’s first payload deployment test, marking what could be the latest milestone for the Elon Musk-owned aerospace company as it develops reusable rockets.

SpaceX readies its seventh test flight of Starship, the most powerful rocket ever designed. The trial will test upgrades to the spacecraft and deploy mock satellites.