A fingertip-sized cube of carbon foam, struck by a laser pulse inside a vacuum chamber during freefall, shot forward at 1.7 meters per second with no chemical propellant involved. The demonstration took place aboard the European Space Agency’s 86th parabolic flight campaign in May 2025, and the results, now published in the peer-reviewed journal Advanced Science, suggest that ultralight graphene aerogels could one day replace onboard fuel for small satellite maneuvers.
That matters because fuel is the single biggest constraint on a satellite’s useful life. Once a spacecraft burns through its propellant reserves, it can no longer correct its orbit, dodge debris, or maintain its assigned position. A thruster that runs on externally delivered light rather than stored chemicals could, in principle, keep a satellite operational for years longer than current designs allow.
What the parabolic flight proved
During roughly 22-second windows of microgravity, the research team placed three graphene aerogel cubes inside glass tubes within a sealed vacuum chamber and fired laser pulses at them. High-speed cameras captured each cube traveling about 50 millimeters in approximately 0.05 seconds. At the laser power levels used in the experiment, the initial thrust pulse measured around 0.6 millinewtons, and peak acceleration exceeded 100 meters per second squared. Those acceleration numbers sound dramatic, but the cubes weigh almost nothing; the force involved is tiny by rocket standards.
ESA researcher Marco Braibanti noted that the aerogels responded within about 30 milliseconds of each laser pulse, according to the agency’s own campaign summary, confirming that the effect is both rapid and repeatable across multiple freefall windows on the same flight.
A companion study published in Materials and Design digs into why the aerogels move. By controlling the freezing direction during fabrication, a process called directional freeze-drying, researchers create aligned pore channels inside the carbon foam. Those channels influence how photons interact with the material’s surface and how absorbed energy converts into mechanical motion. Adjusting density, vacuum level, and laser power all changed the magnitude of displacement, suggesting that thrust is tunable through manufacturing choices rather than being a fixed property of graphene.
Funding for the work came from Khalifa University of Science and Technology and ESA’s parabolic flight program. The paper carries a CC BY 4.0 open-access license, so the full dataset is freely available for independent review.
Where this fits in the broader landscape
Laser-driven propulsion is not a brand-new idea. NASA funds a parallel program studying laser-driven lightsails, which uses thin reflective membranes rather than porous carbon structures but shares the same core goal: eliminating the mass penalty of carrying propellant. Earlier peer-reviewed work published in Scientific Reports documented light-induced propulsion of graphene particles suspended in methanol, establishing through a different experimental setup that graphene can convert photon energy into mechanical motion via photoelectron-related effects. (That study is not linked here because the specific DOI could not be independently verified against the original article’s references.)
The graphene aerogel approach occupies a different niche. Lightsails are designed for deep-space acceleration, pushed by powerful ground-based or orbital laser arrays over long distances. The aerogel concept, by contrast, targets fine-grained station-keeping for small satellites in low Earth orbit, where even tiny, repeated nudges can counteract atmospheric drag and extend a mission by months or years.
The gap between lab demo and orbit
A 50-millimeter push inside a glass tube is a long way from a functioning satellite thruster. Several hard questions remain unanswered in the published literature as of May 2025.
No engineering specification yet describes how graphene aerogels would be mounted on an actual spacecraft bus, how large an aerogel element would need to be to generate useful force on a multi-kilogram platform, or how the system would interact with attitude control hardware. The 0.6 millinewtons of measured thrust is orders of magnitude below what chemical thrusters deliver. For context, a typical CubeSat cold-gas thruster produces roughly 10 to 100 millinewtons. The aerogel approach could still be viable for very small satellites if thrust can be applied continuously, but that has not been demonstrated.
Durability is another open question. Whether the aerogels degrade after repeated laser exposure, how beam divergence over tens or hundreds of kilometers would dilute thrust, and what pointing accuracy a laser source would need are all unaddressed. The parabolic flight produced only brief freefall windows, so the data captures short impulses rather than sustained thrust over minutes or hours. Thermal management under repeated pulses or continuous illumination in vacuum has not been publicly characterized, nor has the upper bound of laser intensity before the aerogel ablates or structurally fails.
The entire quantitative case currently rests on a single flight. No second microgravity campaign has been reported, meaning independent replication remains outstanding. And no peer-reviewed cost analysis compares the economics of laser-driven graphene propulsion against established electric propulsion systems such as ion or Hall-effect thrusters, which already have decades of flight heritage.
Orbital mechanics add further complexity. A laser-driven system must deliver thrust in precisely timed directions to counteract drag, solar radiation pressure, and gravitational perturbations. How a graphene aerogel thruster would be steered, and whether it could operate without contaminating sensitive optics on the same spacecraft, are engineering details that remain speculative until designs move beyond laboratory prototypes.
What satellite operators should watch for next
The strongest evidence sits in the Advanced Science paper itself: specific, reproducible measurements of velocity, acceleration, displacement, and thrust derived from high-speed imaging and known mass. The Materials and Design study adds a materials-engineering layer showing that performance can be dialed in through fabrication. Together, these two journal articles confirm that laser-driven motion of aerogel samples in vacuum and microgravity is a real, measurable effect.
ESA’s newsroom coverage and secondary write-ups provide accessible summaries and institutional framing, but they do not contain data beyond what the journal papers report. NASA’s directed-energy propulsion page offers context for the broader physics of laser-driven spaceflight but does not reference the graphene aerogel work, so drawing a direct line between the two programs requires caution.
For the concept to graduate from laboratory curiosity to mission hardware, the research community will need to produce follow-up microgravity flights confirming the original numbers, long-duration vacuum tests measuring aerogel degradation over hundreds or thousands of laser cycles, and detailed systems-engineering studies mapping power, mass, and pointing requirements onto realistic satellite platforms. Until those results appear, the safest reading is that graphene aerogel propulsion is an experimentally supported phenomenon, promising enough to justify continued investment, but not yet ready to anchor the operations of any satellite in orbit.
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*This article was researched with the help of AI, with human editors creating the final content.
