NASA's DiskSat: The Flat Spacecraft Revolution That Could Replace CubeSats

For years, the CubeSat has been the scrappy underdog of space exploration—a standardized, box-shaped satellite that democratized access to orbit by hitching affordable rides on commercial launches. But what if there was a better shape? What if you could ditch the box entirely and gain dramatically more power, larger antennas, and unprecedented flexibility—all while keeping the same cost advantages that made CubeSats revolutionary in the first place?

NASA’s answer is DiskSat, a radical reimagining of the small spacecraft that replaces the iconic cube with a flat disk. And it could fundamentally reshape how we build satellites, conduct Earth observation, and explore space.

The Problem with Boxes

CubeSats earned their place in the space industry for good reason. Their standardized, modular design made them cheap to produce, easy to launch, and accessible to universities, startups, and research institutions worldwide. The compact form factor meant multiple satellites could stack together in a launch container, making ride-shares affordable and frequent.

But there’s a catch: that boxy design comes with real constraints.

The small surface area limits power generation capacity. The tight quarters restrict where you can place large antennas or scientific instruments that need exposure to space. Want to run demanding sensors or communications systems? The CubeSat’s compact geometry works against you. These physical limitations have forced mission designers to choose between their ambitions and the realities of a box-shaped platform.

For certain missions—those requiring higher power, larger apertures, or more sophisticated instruments—CubeSats hit a ceiling.

Enter the Disk: A Geometry Game-Changer

Developed by The Aerospace Corporation with NASA funding, DiskSat flips the script. Instead of a cube, imagine a flat disk about the size of a large pizza: 40 inches in diameter and just one inch thick. That seemingly simple shape change unlocks something powerful.

The flat geometry offers dramatically more surface area. More surface means more room for solar panels, antennas, and instruments. The thin, plate-like design makes internal components more accessible during assembly and testing—a practical benefit that reduces development time and complexity. And here’s the clever part: multiple DiskSats stack tightly together for launch, then deploy individually in orbit, maintaining all the containerization advantages that made CubeSats attractive in the first place.

What to Watch For

• Surface area advantage: DiskSats provide substantially more surface area than CubeSats of comparable volume, enabling high-power and high-aperture capabilities
• Standardized launch interface: Like CubeSats, DiskSats maintain low launch costs and simple mechanical design through standardized deployment
• Electric propulsion integration: Demonstration missions will test orbit maneuvering and precise altitude control
• Low-altitude Earth observation: DiskSat’s flat profile creates low drag, making very-low-Earth-orbit missions (under 185 miles) more feasible

More Than Just Shape

DiskSat isn’t abandoning the CubeSat ecosystem—it’s building on it. The new platform leverages the same off-the-shelf subsystems that made CubeSats affordable: communication components, navigation systems, and other mass-produced hardware developed for the commercial small-satellite market. This means DiskSat inherits the cost advantages of the CubeSat supply chain while escaping its geometric constraints.

The design is also adaptable. Need a smaller disk? A larger one? The dimensions can scale to match a launch vehicle’s specifications without redesigning the deployment system. It’s flexibility without sacrificing standardization.

What DiskSat Can Do

The expanded capabilities open new mission possibilities that CubeSats struggle with. Satellite constellations requiring high power and large antennas—think communications networks or radar systems—become practical. Missions demanding continuous thrust for precise orbit maintenance or maneuvers from Earth orbit to lunar space suddenly become feasible for small spacecraft.

Perhaps most intriguingly, DiskSat’s low-drag profile makes it ideal for sustained low-altitude operations. Earth observation missions requiring extremely precise, continuous imaging from altitudes below 185 miles become achievable. Climate monitoring, disaster response, and detailed land-use surveillance all benefit from a small spacecraft that can operate reliably in the thin upper atmosphere.

The Demonstration and What’s Next

NASA’s Small Spacecraft & Distributed Systems program is funding a technology demonstration mission with four DiskSats, anticipated to launch no earlier than December 2025. This mission will be the proof of concept: verifying platform performance, testing the deployment mechanism, and showcasing DiskSat’s maneuverability through orbit-changing and altitude-control demonstrations.

If successful, expect DiskSat to evolve from curiosity to standard. Just as CubeSats transformed from niche concept to industry standard, DiskSat could reshape what’s possible for small-spacecraft missions across science, Earth observation, communications, and exploration.

The age of the box in space may not be over—but the age of the disk is just beginning.