Geology Space Missions Spacecraft Lunar Landers Moon Spacecraft Technology Impact Craters Volcanology Volcanism Moon Phases Water on the Moon Lunar Geology Human Spaceflight Apollo Missions Moon Landings Space Exploration Spacecraft Engineering Moon Missions NASA Missions Lunar Impacts Commercial Spaceflight Resource Extraction Planetary Exploration Lunar Surface Exploration Cultural Significance Time Measurement Instruments Impact Cratering Lunar Atmosphere Temperature Analysis Mare Frigoris Spacecraft Design Commercial Lunar Payload Services Space Weathering Chandrayaan Missions Space Technology Astrobiology Moon Impacts Moon Impact Energy Sources Navigation Systems South Pole Exploration Space Infrastructure Geological Activity Resource Utilization Impact Events Planetary Science Moon Exploration Spacecraft Operations Exploration Lunar Origins Surface Analysis Volcanic Formations Temperature Monitoring Volcanic Activity Research Missions Lunar Dust Exploration Technologies Robotic Spacecraft Data Collection Moon's Soil Composition Moon's Early Crust Stereo Cameras Planetary Geology Gravitational Studies Missions to the Moon Lunar Geography Robotic Landers Lunar Landings Landing Techniques Lunar Soil Cultural Beliefs Moon Craters International Observances Moon Distance Extraterrestrial Exploration Resource Acquisition Cultural Astronomy Effects of Moon on Earth Cultural Influence Lunar Cycles Lunar Positioning Moon's Influence Lunar Gravity Moon's Position Mars Exploration Meteor Showers Impact Consequences Payload Analysis Mining Moon Colonization Nuclear Physics Human Presence on Moon Human Space Exploration Energy Generation in Space Outer Space Treaty Spacecraft Testing Permanent Bases Human Activities in Space Extraterrestrial Bodies
The Helios transfer stage would ferry the in‑house lander from Earth orbit to lunar orbit without on‑orbit refueling.