Mini Brains, Lab-Grown Hearts and Artificial Retinas: The Strange Cargo Now on the ISS
In this post
A SpaceX cargo ship arrived at the International Space Station on 15 October 2026 carrying some of the most unusual science payloads in years. Among more than 6,300 pounds (about 2,860 kg) of supplies were tiny lab-grown brain models, 3D human heart tissue and equipment to manufacture artificial retinas. Here is what the CRS-35 space station science program is testing, and why it has to happen in orbit.
The mission in brief
| Detail | Value |
|---|---|
| Mission | SpaceX CRS-35, 35th cargo flight under NASA's CRS-2 contract |
| Launch | 13 Oct 2026, 6:33 a.m. EDT, Falcon 9, Cape Canaveral SLC-40 |
| Spacecraft | Cargo Dragon C211, on its fourth flight |
| Docking | 15 Oct 2026, Harmony module, space-facing port |
| Cargo | about 6,300 lb (2,860 kg) |
| Return | Splashdown off California, mid-November |
Why do biology experiments in space?
On Earth, gravity pulls cells and particles downward. Tissues grown in a dish tend to flatten, settle or clump unevenly. In microgravity, cells can float and arrange themselves in three dimensions more naturally. Thin films can also form more evenly, because nothing sinks.
That makes the space station a useful factory and testbed for things that are hard to make well on the ground.
The highlights on board
Artificial retinas (LambdaVision-1)
This experiment tests building artificial retinas layer by layer in microgravity. The goal is extremely uniform thin layers, which could one day lead to better implants for people losing their sight to retinal diseases.
Brain organoids (MINDS)
Organoids are miniature 3D clusters of cells that mimic parts of real organs. This study uses brain organoids to investigate inflammation linked to Alzheimer's, Parkinson's and multiple sclerosis, with the hope of identifying new treatment targets.
3D heart tissue (Stellar Spheroids)
Cedars-Sinai researchers sent heart and brain organoid experiments, including cardiac spheroids that combine heart muscle cells with blood-vessel lining cells. They want to know whether organoids can be manufactured in large, consistent batches in orbit for disease models and drug testing. A $10 million NASA grant supports six more such missions.
New glass in microgravity
A materials experiment will watch how a new type of glass forms without gravity, which can reveal flaws and structures normally hidden on Earth.
The last set of new solar arrays
Not everything on Dragon was biology. It also delivered the final set of ISS Roll-Out Solar Arrays, or IROSAs. Astronauts will install them during future spacewalks, boosting the power supply of a station that has now been crewed continuously for more than 25 years.
What happens next
Dragon is scheduled to stay about a month, then return to Earth with completed experiments and splash down off the California coast in mid-November. Samples that must be analyzed quickly, such as living tissues, ride back in Dragon's pressurized cabin.
Sources
Frequently asked questions
What did CRS-35 carry to the space station?
About 6,300 pounds of supplies and science, including brain organoids, 3D heart tissue, artificial-retina hardware, glass experiments and the final IROSA solar arrays.
When did CRS-35 launch and dock?
It launched on 13 October 2026 and docked on 15 October.
What are brain organoids?
Small 3D clusters of brain cells grown from stem cells that imitate some features of real brain tissue.
Why make artificial retinas in space?
Microgravity can produce more uniform thin layers, which could improve future retinal implants.
How many times has this Dragon flown?
CRS-35 was the fourth flight of Cargo Dragon C211, after CRS-26, CRS-29 and CRS-33.