High above the Atlantic this morning, a SpaceX Dragon capsule is gliding toward the International Space Station on the final leg of a journey that began before sunrise on Tuesday. If all goes to plan, Dragon will dock autonomously with the station’s Harmony module at around 11 a.m. EDT today, delivering more than 6,300 pounds of supplies, scientific hardware, and one very consequential piece of equipment: the final pair of roll-out solar arrays that will complete the largest power upgrade in the orbiting laboratory’s history.

The mission, designated CRS-35 — the 35th flight under NASA’s Commercial Resupply Services contract with SpaceX — is in many ways a portrait of what the space station has become in its third decade: part power plant under renovation, part cutting-edge medical laboratory, and part logistics hub for a space program stretching toward the Moon. Tucked inside Dragon’s pressurized cabin are experiments that could one day restore vision to the blind, grow better models of the human heart, and uncover new treatment targets for Alzheimer’s, Parkinson’s, and multiple sclerosis.

It is, in short, a routine cargo run that is anything but routine.

A Sunrise Launch That Lit Up the Eastern Seaboard

The mission began at 6:33 a.m. EDT on Tuesday, October 13, when a Falcon 9 rocket lifted off from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida. The timing — just before sunrise — produced one of the most photographed launch phenomena in recent memory: a glowing, billowing plume that spread across the dawn sky like a jellyfish drifting through dark water.

A Falcon 9 rocket climbs through the dawn sky. Launches near sunrise or sunset can light up the exhaust plume like a glowing jellyfish. Image: Unsplash.

The spectacle was visible far beyond Florida. Early risers in Georgia, the Carolinas, Kentucky, Mississippi, and central Pennsylvania reported seeing the luminous cloud arcing northeast. Getty Images photographer Gary Hershorn captured it from Hoboken, New Jersey, as the plume drifted past lower Manhattan and One World Trade Center. NASA even took to social media to ask the public for more photos.

The “space jellyfish” is a well-understood trick of light, not a mystery. When a rocket launches near sunrise or sunset, it climbs high enough to catch direct sunlight while observers on the ground are still in darkness. The sun then illuminates the expanding exhaust plume from below, painting it in vivid color against the dark sky. As WRAL meteorologist Chris Michaels explained, “the sun is low on the horizon in the eastern sky, illuminating the vapor trail as it zooms northeast.”

About seven and a half minutes after liftoff, the mission’s first stage — booster B1096, flying its eighth trip to space and back — touched down at Landing Zone 40, just a short hop from the launch pad. The thunderous sonic boom of its return rolled across the spaceport and beyond, a now-familiar soundtrack to SpaceX’s reusability program. Two minutes later, the Cargo Dragon spacecraft, tail number C211, separated from the Falcon 9’s upper stage, opened its nosecone, and began a carefully choreographed series of thruster burns for the two-day transit to the station.

Thirty-Five Flights and Counting

There was a time when every cargo flight to the space station was a white-knuckle engineering event. CRS-35 is evidence of how far the Commercial Resupply Services program has come. Since the first Dragon cargo mission in 2012, SpaceX has turned station resupply into something approaching scheduled airline service — so standardized, in fact, that NASA now describes these flights as operational infrastructure rather than novel feats of engineering.

That standardization is precisely what makes the science possible. Because the ride to orbit is reliable, researchers can plan delicate experiments — living tissues, precision-manufactured implants, fragile glass samples — with confidence that they will arrive intact and on schedule. Dragon is expected to remain docked at the station until mid-November, when it will depart and splash down off the coast of California carrying time-critical research and return cargo.

NASA is providing live coverage of today’s rendezvous and docking beginning at 9:15 a.m. EDT on its streaming platforms, a reminder that even routine operations in orbit still draw an audience. There is something quietly remarkable about watching a spacecraft park itself, uncrewed, at a port the size of a doorway while both vehicles race around Earth at 17,500 miles per hour.

The Final Pair of Wings

The most consequential hardware riding inside Dragon is not in the pressurized cabin at all. Nestled in the spacecraft’s unpressurized trunk are two rolled-up solar wings — the fourth and final pair of International Space Station Roll-Out Solar Arrays, known as iROSAs, built by Redwire Space.

When astronauts install them during a series of spacewalks planned for later this fall, the station’s power system augmentation — a campaign years in the making — will be complete.

The final pair of roll-out solar arrays will complete the space station’s power upgrade this fall. Image: Unsplash.

To understand why this matters, it helps to know the problem the arrays solve. The space station’s original solar wings have been generating electricity since the early 2000s, and like all solar panels, they have degraded with age and relentless exposure to radiation and thermal cycling. Rather than undertaking the complex and risky work of removing the legacy wings, NASA chose an elegant overlay strategy: each new roll-out array is mounted in front of an existing wing, partially shadowing it while adding far more generation capacity than is lost.

Each iROSA is capable of producing more than 20 kilowatts of power and is designed to operate for over a decade. Six are already installed. With those six in place, the station now generates more than 250 kilowatts — a jump of over 30 percent in available power, according to NASA’s Space Technology Mission Directorate. The final pair is expected to add roughly another 15 kilowatts, pushing the orbiting laboratory to its highest-ever electrical generation capacity.

That electricity is not an abstract luxury. It powers the station’s life-support systems, its communications, and — crucially — the hundreds of scientific investigations running aboard at any given time. Many of the most power-hungry experiments, from materials furnaces to advanced life-science incubators, simply could not run on the station’s original power budget. The augmentation campaign has effectively given the 25-year-old outpost a new lease on scientific life.

Power for the Final Decade

There is another, less romantic reason the extra power matters: the station’s eventual retirement. NASA plans a safe, controlled deorbit of the International Space Station in the early 2030s, steering the massive structure into a remote stretch of the Pacific Ocean. That maneuver will require a healthy, fully powered station — visiting vehicles, propulsion, and guidance systems all draw on the electrical grid.

In other words, CRS-35 is delivering hardware that changes the station itself during the later stage of its operational life. It is a fitting role for a cargo mission: not merely restocking the shelves, but upgrading the building. The campaign’s success also establishes an important precedent — that aging orbital infrastructure can be meaningfully upgraded in place rather than replaced. That lesson is likely to shape how future long-duration platforms, from commercial space stations to a permanent lunar base, are designed and serviced.

The installation itself will be no small feat. Astronauts will venture outside during spacewalks this fall to mount the arrays, unroll them, and connect them to the station’s power channels — delicate work performed in bulky gloves while orbiting Earth every 90 minutes. NASA has been preparing for these spacewalks for months, rehearsing the choreography in the Neutral Buoyancy Laboratory’s giant training pool in Houston.

A Floating Laboratory Full of Medical Promise

If the solar arrays are the mission’s brawn, the pressurized cargo is its brain — and, quite literally in one case, its heart. CRS-35 carries more than 40 science investigations, but four medical and materials payloads stand out for what they might mean for people on Earth.

Building Artificial Retinas, Layer by Layer

The experiment called LambdaVision-1 tackles one of medicine’s stubborn frontiers: restoring vision lost to retinal disease. The idea is to manufacture an artificial retina by depositing ultra-thin layers of a light-sensitive protein — bacteriorhodopsin — one atop another, building the implant the way a printer builds a page.

On Earth, gravity is the enemy of this process. As each layer forms, particles settle and drift downward, producing uneven films that can compromise the implant’s performance. In microgravity, that settling all but disappears. The layers form more evenly, and a more even implant should work better. LambdaVision’s goal is to demonstrate that orbit is simply a better factory for these delicate structures — and that the resulting artificial retinas could one day help patients with retinal conditions for which no cure currently exists.

It is a striking example of a broader trend: using the space station not just as a laboratory for discovery, but as a manufacturing platform where the absence of gravity is itself the product.

Hearts in Zero Gravity

The Stellar Spheroids investigation takes a different approach to the same insight. Researchers are growing small, three-dimensional models of human heart tissue — spheroids — to study whether microgravity helps blood-vessel networks form inside them.

On Earth, growing realistic heart tissue in a dish is notoriously difficult. Gravity collapses delicate structures before they can organize, forcing scientists to rely on artificial scaffolds that can distort the biology they are trying to study. In orbit, tissues can self-assemble more naturally. If the experiment shows that vascular networks develop more faithfully in microgravity, the payoff could be twofold: better laboratory models of heart disease, and a path toward large-scale drug testing on tissue that behaves more like the real organ.

For pharmaceutical research, that matters enormously. Drugs that look promising in flat layers of cells in a petri dish frequently fail in the complexity of a living body. Tissue models with genuine blood-vessel architecture could help researchers weed out failures earlier — and do it without animal testing.

In orbit, living tissues can self-assemble in ways gravity prevents on Earth. Image: Unsplash.

Villages of Mini-Brains

Perhaps the most evocative payload is MINDS, which sends aloft tiny lab-grown clumps of human brain tissue — brain organoids — to study the inflammation linked to Alzheimer’s disease, Parkinson’s disease, and multiple sclerosis.

What makes MINDS unusual is its design. Each organoid is assembled from cells pooled from several different donors, a configuration the research team calls an “organoid village.” The idea is that a village of organoids better represents the genetic diversity of real patients than tissue grown from a single cell line — so any treatment targets the experiment uncovers are more likely to hold up across the population.

Neuroinflammation — the brain’s immune response gone awry — is increasingly suspected of playing a central role in neurodegenerative disease. Yet studying it in living patients is extraordinbly difficult; the brain does not lend itself to biopsy. Organoids offer a window into the process, and microgravity may make that window clearer by allowing the tissues to develop with less mechanical stress. If the experiment identifies molecular signals or drug targets associated with harmful inflammation, it could open new therapeutic avenues for diseases that collectively affect tens of millions of people worldwide.

Brain organoids aboard the station may reveal new targets for neurodegenerative disease treatments. Image: Unsplash.

Glass From Another World

The fourth headline experiment, ELF-Unconventional Glass 2, sounds like science fiction but addresses a very practical question: what happens when you melt glass made from unusual, heavy elements without gravity pulling the molten blob apart?

On Earth, molten glass sags, convects, and picks up contamination from whatever container holds it. Aboard the station, the Electrostatic Levitation Furnace suspends samples in mid-air using electric fields — no container, no contact, no gravity-driven distortion. Researchers can then watch how exotic glass compositions form and freeze, and return the solid samples to Earth for analysis.

The resulting materials could offer advantages in strength, optical clarity, and durability, with potential applications from fiber optics to specialized lenses. It is fundamental materials science with a long tail — the kind of research whose payoffs arrive years later in products nobody has yet imagined.

The Quiet Extras

Beyond the headline investigations, NASA’s Biological and Physical Sciences program is flying studies of crop disease, rapid astronaut-health diagnostics, and antibiotic-resistant bacteria — research aimed squarely at the challenge of keeping crews healthy on longer missions, where Earth-based laboratories and regular resupply are not an option. As NASA pushes toward the Moon under the Artemis program and eventually Mars, understanding how microbes and human physiology behave far from home is mission-critical.

And then there is the manifest’s most human detail: a collapsible emergency urinal being tested for the Artemis III lunar landing. Spaceflight’s grandest ambitions still come down, occasionally, to plumbing. Every system that keeps astronauts alive and comfortable on the Moon must be tested somewhere first — and the space station remains the proving ground.

Why Microgravity Manufacturing Matters

Step back from the individual experiments and a larger pattern emerges. For most of the space station’s life, it has been framed primarily as a laboratory for discovery — a place to learn how fire burns, fluids flow, and bodies change without gravity. CRS-35 illustrates its second act: the station as a factory where weightlessness is a manufacturing input.

The logic is simple and powerful. Gravity is a constant source of defects in precision manufacturing: it causes sedimentation in layered materials, convection in molten substances, and collapse in delicate biological structures. Remove it, and processes that are marginal on Earth become viable in orbit. Artificial retinas, perfect crystals, exotic glasses, engineered tissues — an entire catalog of high-value products may simply be better made in space.

This is not just academic. A commercial space economy in low Earth orbit depends on finding things worth making up there, and biotech manufacturing is among the most promising candidates. Missions like CRS-35 are, in effect, pilot production runs for an industry that does not fully exist yet — one in which the return cargo splashing down off California is worth far more than the supplies that went up.

What Happens Next

Today’s docking is only the beginning of CRS-35’s work. Once Dragon is berthed and its hatch opened, the station’s crew will begin the methodical process of unloading more than three tons of cargo — a cosmic moving day that takes far longer than the two-day flight that preceded it.

Later this fall, astronauts will don spacesuits and head outside to install the final pair of solar arrays, completing the power upgrade and giving the station its highest electrical capacity ever. The experiments, meanwhile, will run their course over the coming weeks: retinas layered, tissues grown, organoids observed, glass levitated and melted. Results will take months to a year of analysis after samples return to Earth — science at orbital pace is patient work.

When Dragon departs in mid-November, it will carry home the frozen samples, manufactured prototypes, and data drives that are the mission’s true payload. The supplies went up; the knowledge comes down.

The space station remains humanity’s premier laboratory for science that can only be done in microgravity. Image: Unsplash.

There is a tendency to treat cargo missions as the unglamorous plumbing of spaceflight — necessary, but not newsworthy next to crewed launches and Moon shots. CRS-35 is a reminder that the plumbing matters. Every future mission, from the Artemis landings to the first Mars transit, will depend on the unglamorous mastery of logistics, power, and life support being refined aboard the station right now.

And somewhere in Dragon’s cargo hold, floating in the quiet dark between Earth and the station, are a few grams of protein being layered into an artificial retina — built in a place where gravity cannot ruin it, bound for a future where someone might see because of it. That is worth looking up for.

Dragon’s docking coverage begins at 9:15 a.m. EDT today on NASA’s streaming platforms, with docking scheduled for approximately 11 a.m. EDT.