if needed. The ERM also features batteries and small surface-mounted solar panels to power the module on its way to the Moon. A small science airlock was planned for the module during early designs in order to transfer scientific payloads outside the Gateway, but recent designs lack the airlock. The ERM is scheduled to launch on an SLS Block 1B launch vehicle in 2028, along with Artemis 5. Packed inside the module will be approximately 1.5 tons of cargo for ESPRIT and Gateway operations. Orion will dock to ESPRIT following launch and deliver it to Gateway. See also Power and Propulsion Element, a core module of the Gateway that will power ESPRIT once docked and maintain the station's orbit Habitation and Logistics Outpost, the first habitation module of Gateway, featuring the port that ESPRIT will dock to International Habitation Module, the second habitable module of Gateway References Lunar Gateway 2020s in spaceflight