NASA has reopened one of the quieter lanes into cislunar space: small spacecraft riding alongside Artemis. The agency said organizations interested in launching CubeSats on future Artemis missions should respond to a request for information by Monday, June 1 , for initial consideration. The opportunity is not a mission award yet. It is a market check. NASA wants to know who is ready, what they want to fly, and how those payloads could fit on Artemis III, Artemis IV, and Artemis V while the agency reviews exact mission profiles. CubeSats can deploy after Orion separates from the rocket, turning unused secondary payload capacity into science and technology demonstrations. Credit: AI-generated image What NASA Is Asking For NASA's May 21 notice asks universities, companies, research groups, and other organizations to signal interest in CubeSat opportunities tied to the next three Artemis flights. The agency says the Space Launch System rocket can provide rides for small investigations that support science, technology, and the expansion of human exploration. The request focuses on 6U and 12U CubeSats . A CubeSat unit is a 10 by 10 by 10 centimeter building block, so these spacecraft are compact by design. That constraint is the point. They are small enough to tuck into available payload slots, but capable enough to test instruments, communications hardware, autonomy, propulsion, radiation sensors, and operational concepts beyond low Earth orbit. June 1 RFI response deadline 6U Smaller target class 12U Larger target class III-V Artemis missions in scope Why it matters Artemis secondary payload slots are limited, but they put small spacecraft on trajectories that are expensive to reach any other way. For a cislunar startup or research lab, a single slot can validate hardware in the environment where future lunar infrastructure has to work. The Flight Paths Are Still Flexible NASA says it is still reviewing mission profiles, which means the final deployment options could change. The agency currently expects CubeSats may deploy in Earth orbit or onto a heliocentric disposal trajectory after Orion separates from the rocket. It also says opportunities may exist for CubeSats deployed on a reentry trajectory from Earth orbit. That range matters. A payload that deploys in Earth orbit can test communications, sensors, propulsion, or rapid mission operations near home. A heliocentric trajectory can support radiation, navigation, solar science, and deep-space hardware validation. A reentry trajectory could support heat shield, tracking, communications blackout, or debris survival research. Possible deployment path What it can test Cislunar relevance Earth orbit Operations, communications, autonomy, propulsion checkout Reduces risk before lunar distance missions Heliocentric disposal Radiation sensors, deep-space navigation, solar observations Validates hardware outside Earth's protective environment Reentry trajectory Thermal protection, tracking, breakup and recovery concepts Feeds entry, descent, and disposal planning for lunar systems AI-generated image Small spacecraft can test sensors, software, radiation tolerance, and navigation techniques in the same environment future lunar infrastructure will occupy. A Second Chance After Mixed Artemis I Results NASA has flown CubeSats on Artemis before. The uncrewed Artemis I mission in 2022 carried 10 CubeSats , deployed after the upper stage separated from Orion. Artemis II carried four on its crewed lunar flyby. Those flights proved the ride-share model, but they also showed how unforgiving secondary payload missions can be. CubeSats are often constrained by long prelaunch storage, limited power, tight mass budgets, small antennas, and modest propulsion. A spacecraft can be technically clever and still struggle if batteries self-discharge, if a low-gain antenna cannot close the link, or if a tiny propulsion system underperforms after months on the ground. Artemis slots are valuable, but they are not easy. That is why the new RFI is more than a call for science ideas. It is also a readiness filter. NASA needs payload teams that can survive the integration schedule, meet safety requirements, support mission operations, and deliver useful data even if deployment timing or trajectory details shift. What strong proposals will likely need • Clear mission value: A payload should connect to Artemis science, exploration systems, or cislunar operations. • Storage resilience: Small spacecraft may sit integrated for long periods before launch. • Independent operations: Once deployed, the CubeSat team must handle command, tracking, and data return. • Trajectory tolerance: NASA is still reviewing exact profiles, so flexible mission design helps. AI-generated image Secondary payload teams must fit into the larger Artemis integration flow, where crew mission requirements always come first. Small Payloads, Big Infrastructure Implications The most interesting part of the notice is not the CubeSat form factor. It is the destination set. NASA is asking about payloads tied to Artemis III, IV, and V, a period when the agency is trying to turn one-off lunar missions into repeatable operations. Small spacecraft can help fill the gaps between flagship hardware. A 6U or 12U spacecraft will not build a lunar economy by itself. It can, however, retire one narrow risk that a larger system depends on. A small relay experiment can test antenna pointing. A radiation monitor can map conditions during a specific mission phase. A navigation payload can compare autonomous fixes against ground solutions. A propulsion experiment can prove whether a tiny spacecraft can maneuver enough to be useful after deployment. Those incremental tests are easy to underrate. Cislunar infrastructure will depend on many small capabilities working reliably at once: timing, communications, navigation, thermal control, autonomy, power management, and radiation tolerance. CubeSats give NASA and outside teams a way to test pieces of that stack without waiting for a dedicated lunar spacecraft procurement. Navigation Autonomous position fixes and timing experiments can support future lunar traffic management. Communications Small relays can test antennas, protocols, and low-power links beyond low Earth orbit. Radiation Compact sensors can help characterize exposure during Artemis mission phases. Propulsion Low-thrust systems can prove maneuvering concepts for small support spacecraft. Autonomy Onboard fault response becomes more valuable as missions operate farther from Earth. Disposal Reentry and disposal experiments can inform safer cleanup rules for future traffic. AI-generated image A future cislunar operating environment will need many small services around the major spacecraft. CubeSats are one way to start testing those services early. Who Should Care The obvious audience is the university spacecraft community, which has long used CubeSats as a training ground for engineers and scientists. The more strategic audience is commercial. A lunar communications company, sensor startup, small propulsion vendor, software autonomy team, or radiation-hardened electronics supplier could use an Artemis slot to show that its hardware works where customers need it. There is also a policy angle. NASA can use secondary payloads to widen participation in Artemis without changing the crew mission. If selected payloads come from universities, smaller companies, international partners, or state-backed research groups, the program gets more stakeholders and more data for a relatively small mass penalty. The catch is that Artemis does not exist to carry CubeSats. The crew mission drives the schedule, safety posture, and integration priorities. Payload teams need to treat the ride as a bonus opportunity, not a custom launch service. The strategic read NASA is asking a practical question: which small spacecraft are mature enough to add value without adding crew mission risk? The answer will help