SpaceX launches final solar arrays to the International Space Station on CRS-35 mission

• The CRS-35 mission carried more than 6,300 pounds of cargo to the International Space Station.
• The spacecraft transported the final pair of ISS Roll-Out Solar Arrays, known as iROSAs.
• The research cargo includes experiments involving artificial retinal tissue, 3D heart-tissue models and brain organoids.

SpaceX launched its CRS-35 cargo mission to the International Space Station (ISS) on Tuesday, carrying critical power-system hardware, research equipment and supplies for the crew aboard the orbiting laboratory.

NASA said the Dragon spacecraft lifted off at 6:33 a.m. EDT from Cape Canaveral, Florida, aboard a Falcon 9 rocket. The flight marks SpaceX’s 35th commercial resupply mission to the station for NASA.

A key part of the cargo is the final pair of International Space Station Roll-Out Solar Arrays, or iROSAs. The arrays will augment the station’s electricity-generation capacity as NASA continues upgrading the power system of the aging orbital complex.

The mission combines that infrastructure work with experiments designed to take advantage of microgravity, making the flight part of the station’s ongoing role as a platform for research that is difficult to conduct on Earth.

Why are the final solar arrays important?

The iROSAs form part of a multistage effort to strengthen the ISS power system. The final pair will add to the station’s existing solar-array capacity, supporting research, life-support systems and other operations that depend on a reliable supply of electricity.

The cargo also includes equipment for station maintenance and repairs. According to the mission manifest described in launch coverage, the shipment includes a clamshell apparatus intended to hold a failed joint from the station’s Canadarm2 robotic arm, which was removed during a June 30 spacewalk.

Other supplies include equipment for the station’s toilet system and tools for work aboard the outpost. Together, the items show how resupply flights support both scientific work and the maintenance needed to keep the station operating.

What scientific experiments are on board?

NASA’s prelaunch overview described research hardware for producing artificial retinal tissue and three-dimensional heart-tissue models, along with studies of glass formation and brain organoids. The experiments are intended to help researchers investigate biological and materials-science processes in microgravity.

The research could inform future medical and scientific work on Earth, but these are research objectives rather than proven treatments or commercial products.

The flight also highlights the repeated use of SpaceX’s cargo fleet. Spaceflight Now reported that Dragon spacecraft C211 was making its fourth cargo mission, while Falcon 9 booster B1096 was flying for the eighth time. NASA confirmed that the spacecraft reached orbit and separated from the rocket’s second stage roughly nine minutes after liftoff.

Dragon is scheduled to arrive at the ISS around 11 a.m. EDT on Thursday, October 15, and dock autonomously with the Harmony module. It is expected to remain attached for about a month before returning to Earth with research materials and other cargo. The schedule remains subject to flight operations.

The mission is part of NASA’s continuing use of commercial providers to move supplies and experiments between Earth and the station. While the sources reviewed do not disclose a specific payment for CRS-35, the flight demonstrates the recurring logistics that allow the ISS to continue operating as a research platform.

Attention now shifts from launch to docking and cargo operations. If the schedule holds, the final solar-array hardware and the research payloads will be incorporated into station activities, with experiment data analyzed after the planned work in orbit.