The International Space Station just received one of its most important deliveries of the year. SpaceX's 35th cargo mission for NASA, known as CRS-35, launched on Tuesday, October 13, and docked two days later carrying more than 6,300 pounds of experiments, supplies and hardware. Tucked inside the Dragon's unpressurised trunk was something special: the final pair of Roll-Out Solar Arrays that will round off a multi-year power upgrade for the ageing orbital lab.
Here is a clear, no-hype breakdown of what flew, why it matters, and what happens next.
Launch and Docking: A Smooth Two-Day Trip
A Falcon 9 rocket lifted off from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida at 6:33 a.m. EDT on October 13 (that's 2:33 p.m. in Dubai). According to Spaceflight Now, the first stage was booster B1096 on its eighth flight, and the spacecraft was Cargo Dragon C211, making its fourth trip to the station after the CRS-26, CRS-29 and CRS-33 missions.
Dragon then spent about two days catching up with the station before docking autonomously at 11 a.m. EDT on Thursday, October 15, at the space-facing (zenith) port of the Harmony module. That port had been freed up when Crew Dragon Freedom brought the Crew-12 astronauts home on October 8.
The station is busy right now. NASA's station blog noted that on October 16 five spacecraft were attached at once: the CRS-35 and Crew-13 Dragons, Soyuz MS-29, and the Progress 95 and 96 cargo ships. The seven-member Expedition 75 crew has already started unpacking.
The Science Riding Along
Cargo missions are really science missions in disguise, and CRS-35 carries several studies that could matter back on Earth. NASA highlighted four main areas:
- Artificial retinas: hardware to manufacture artificial retinas in microgravity.
- 3D heart tissue: heart tissue models designed for large-scale drug testing.
- New glass: materials to study how a new type of glass forms when gravity isn't pulling ingredients apart.
- Brain organoids: tiny lab-grown brain models used to look for treatment targets for diseases such as Alzheimer's, Parkinson's and multiple sclerosis.
Alongside the research, Dragon brought practical station gear. Spaceflight Now reports the cargo includes a clamshell container for a failed Canadarm2 joint that was removed during a June 30 spacewalk, a toilet dose pump, water pre-treat quality sensors and a robotic maintenance tool. Unglamorous, maybe, but this is exactly the kind of equipment that keeps a 25-year-old station running.
Why the Last Solar Arrays Matter
The station's original solar wings have been generating power since the early 2000s, and like any solar panel they slowly lose efficiency over time. NASA's answer has been the iROSA programme: compact arrays that roll out like a carpet and are mounted on top of the existing wings, boosting overall power without replacing the old structures.
CRS-35 carries the final pair. NASA says astronauts will install them during spacewalks later this fall. Once they are in place, the upgrade campaign that began years ago will be complete, giving the station extra power headroom for experiments during its remaining years in orbit.
What Happens Next
Dragon is scheduled to stay attached for roughly a month. During that time the crew will move experiments into the station's labs, run the research, and load Dragon with finished samples. Around mid-November, the capsule will undock and splash down off the coast of California, which lets scientists get time-sensitive samples into labs quickly.
Quick tip for space fans: NASA posts near-daily updates on its Space Station blog, and spacewalks are usually streamed live on NASA's channels. If you want to watch the solar arrays go up, keep an eye on the blog for spacewalk dates once NASA announces them.
Conclusion
CRS-35 may sound like a routine resupply run, but it ticks several big boxes at once: fresh medical and materials research, spare parts for the station's robotic arm, and the last piece of a long-running power upgrade. With the arrays scheduled to go up on upcoming spacewalks and Dragon due home in mid-November, there's plenty more to follow on this mission. We'll keep tracking it here on Browsing Spot.