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Scientists Develop a Self-Folding Satellite That Uses Sunlight to Change Its Shape

Imagine a satellite that can change its shape while travelling through space, unfold itself without traditional mechanical systems, and even use sunlight as a source of propulsion. This futuristic concept could become possible with a new type of spacecraft called OrigamiSat, developed by researchers led by Aloisia Russo and her team.

Inspired by the ancient Japanese art of paper folding, OrigamiSat is designed to fold, unfold, and transform into different shapes while operating in space. What makes this concept particularly interesting is that it combines two technologies: 4D-printed smart materials and solar radiation pressure. Together, they could allow the spacecraft to change its configuration using heat and the gentle force of sunlight.

The research could open new possibilities for designing lightweight, multifunctional spacecraft that perform several tasks without requiring separate large structures.

Why Do Satellites Need to Change Their Shape?

Modern spacecraft often carry several large structures, including solar panels, antennas, and communication equipment. These components are usually folded during launch to save space inside the rocket. Once the spacecraft reaches orbit, special deployment mechanisms unfold them.

Although this approach works well, it has some limitations. Traditional deployable structures often require hinges, motors, springs, and other mechanical components. These systems increase complexity, add weight, and introduce more potential points of failure.

This is where origami-inspired engineering could make a difference.

Origami designs allow large structures to be folded into compact shapes and expanded when needed. One well-known example is the Miura fold, a folding pattern that allows a large surface to collapse into a small package and unfold through a coordinated movement.

Scientists have already explored origami-inspired designs for solar panels, antennas, expandable space habitats, and other spacecraft components.

However, most existing designs are intended to deploy into one fixed configuration. The new OrigamiSat concept takes this idea further by allowing a spacecraft to repeatedly change its shape and potentially perform different functions.

What Makes OrigamiSat Different?

Unlike conventional satellites, OrigamiSat is designed as a reconfigurable spacecraft.

It uses a thin, highly reflective material called aluminised Kapton (Al-Kapton), which is commonly associated with solar sail technology. This reflective film acts as the main surface of the spacecraft.

An origami folding pattern is then created directly on the film using 3D printing. This produces a lightweight structure made of interconnected panels, known as facets, that can move relative to one another.

The spacecraft could operate in several configurations.

For example, when completely flat, it could function as a solar sail, using sunlight to generate propulsion without conventional rocket fuel. It could then fold into another shape, potentially forming a parabolic reflector for communication or other space applications.

This means a single spacecraft could perform multiple roles simply by changing its physical structure.

How Can Sunlight Make a Satellite Fold?

One of the most fascinating aspects of OrigamiSat is its ability to use sunlight as a source of mechanical force.

Although sunlight does not have mass, photons carry momentum. When they strike a reflective surface, they transfer a small amount of momentum to it. This creates a tiny force known as Solar Radiation Pressure (SRP).

The force is extremely weak compared with conventional rocket propulsion. However, in space, where there is almost no atmospheric resistance, even small forces can produce meaningful effects over time.

Solar sails are specifically designed to take advantage of this phenomenon. Their large reflective surfaces capture momentum from sunlight, allowing spacecraft to accelerate without carrying traditional propellant.

The researchers propose using this same principle to help OrigamiSat change its shape.

Their approach involves controlling the optical properties of individual spacecraft panels. Instead of keeping every surface equally reflective, the researchers propose changing selected panels from mirror-like reflection to diffuse reflection.

This process is called Surface Reflectivity Modulation (SRM).

By changing how different panels interact with sunlight, the spacecraft can control the distribution of radiation pressure forces across its structure. These forces can generate rotational movement around the folding edges, helping the connected panels move into new configurations.

Numerical simulations showed that this approach could trigger folding and even reverse the folding direction by controlling the reflectivity of connected panels.

The simulations also suggested that a thick-origami design needs facets with an edge length of at least one metre to generate sufficient forces from sunlight.

The Secret Behind Its Self-Folding Technology: 4D Printing

Sunlight alone may not provide enough force to control every folding movement. Therefore, the researchers combined solar radiation pressure with another technology called 4D printing.

Unlike conventional 3D printing, which produces objects with a fixed shape, 4D printing uses smart materials that can change their shape when exposed to external conditions such as heat.

The researchers used Shape Memory Polymers (SMPs), also known as 4D materials, in selected folding edges.

These materials can be programmed to remember a particular shape. When heated, they respond by moving towards that programmed configuration.

For OrigamiSat, the researchers integrated this material into specific hinges. When heat is applied, the hinges activate and help the spacecraft fold or unfold.

An onboard electrical system was used to heat the smart material and trigger the folding movement. In future designs, heating wires could be embedded directly inside the 4D hinges to make the system more integrated.

Importantly, not every edge needs to contain shape-memory material. Using it only at selected locations can reduce the spacecraft's overall weight.

Two Different Folding Mechanisms Were Tested

The research team investigated two different hinge designs to determine which would work best for a lightweight, self-reconfiguring spacecraft.

1. Cartilage-like hinges

This design combines elastic thermoplastic polyurethane (TPU) with shape-memory polymer material.

The TPU makes the folding edges flexible, allowing them to stretch and bend more naturally. The shape-memory polymer provides the movement needed for controlled folding.

2. Mechanical hinges

In this design, conventional mechanical hinges are manufactured using acrylonitrile butadiene styrene reinforced with carbon fibres (ABS/cc).

These hinges provide mechanical strength but rely on a more traditional folding mechanism.

After comparing both designs, the researchers found that the cartilage-like hinge was more suitable for their lightweight OrigamiSat concept. It offered better printing accuracy and made more effective use of the shape-memory material, supporting autonomous deployment.

How Was the OrigamiSat Manufactured?

Manufacturing such a spacecraft requires materials that are lightweight, flexible, and strong enough to survive repeated folding.

The researchers used three main materials for their prototype.

  • Aluminised Kapton: A thin, highly reflective film that serves as the solar sail surface.

  • TPU 95A: An elastic material printed directly onto the Kapton film to create flexible connections and folding regions.

  • ABS/cc: Carbon-fibre-reinforced plastic incorporated into the structure to improve its mechanical strength.

The shape-memory polymer was added only to selected edges where heat-triggered movement was required.

This combination allowed the researchers to produce a hybrid structure that integrates reflective surfaces, flexible hinges, and smart actuators.

The use of additive manufacturing also makes it easier to experiment with different folding patterns and material combinations without relying entirely on complicated manual assembly.

What Could This Technology Mean for Future Space Missions?

The potential applications of OrigamiSat extend beyond simply unfolding solar panels.

A spacecraft capable of changing its shape could switch between different operational modes depending on mission requirements.

For example, it could operate as a solar sail during long-distance travel, transform into a reflector for communication, or adopt other configurations for specialised scientific tasks.

It could also help spacecraft adjust their surface area and mass distribution, potentially providing new ways to control their movement and orientation in orbit.

Another interesting possibility is using multiple OrigamiSats working together as a swarm. Such a system could offer greater flexibility for future space missions.

However, several challenges remain. Solar radiation pressure is extremely weak, and controlling the folding movement becomes more complicated as the number of connected panels increases. The spacecraft must also manage its orientation while changing shape, because its rotation and folding movements can influence each other.

The researchers' simulations showed that additional control systems and improved algorithms may be needed to achieve reliable movement across more complicated origami designs.

A New Direction for Spacecraft Engineering

The OrigamiSat concept represents an interesting shift in spacecraft design. Instead of building satellites with separate structures for every task, engineers could eventually develop spacecraft that physically transform to meet different mission requirements.

By combining 4D-printed shape-memory materials, flexible 3D-printed hinges, and the gentle force of sunlight, Aloisia Russo and her team have demonstrated a possible route towards lightweight, self-reconfiguring spacecraft.

The technology is still at the research and prototype stage, and practical space missions will require further testing and development. Nevertheless, the idea offers an exciting possibility: future satellites may not simply unfold once after launch. They could continuously change their shape to perform different jobs while travelling through space.

Reference: Aloisia Russo et al., "Mechanical Design of Self-Reconfiguring 4D-Printed OrigamiSats: A New Concept for Solar Sailing", Front. Space Technol.,Volume 3 - 2022 | https://doi.org/10.3389/frspt.2022.876585

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