SpaceX Dragon Delivers 6,500 Pounds of Cargo to ISS

SpaceX successfully launched and docked its Dragon cargo spacecraft to the International Space Station on May 15-17, 2026, delivering approximately 6,500 pounds (2,950 kg) of supplies, equipment, and scientific experiments to the Expedition 74 crew. The mission, designated CRS-34, marked SpaceX’s 34th Commercial Resupply Services flight for NASA and set a new reusability record for the company’s cargo spacecraft.

Launch and Docking

After two weather-related delays, the Falcon 9 rocket lifted off from Pad 40 at Cape Canaveral Space Force Station in Florida on May 15 at 6:05 p.m. EDT, as CBS News reported. The rocket’s first stage, making its sixth flight, executed a successful landing at Landing Zone 40 approximately seven and a half minutes after liftoff.

The Dragon capsule separated from the Falcon 9 upper stage roughly nine and a half minutes after launch and began its pursuit of the orbiting laboratory. After a 36-hour journey traveling at approximately 28,000 km/h, the spacecraft autonomously docked to the forward port of the Harmony module on May 17 at 6:37 a.m. EDT, according to Space.com.

A Record of Reusability

This particular Dragon capsule made its sixth flight to orbit — a new record for a SpaceX cargo spacecraft. The Falcon 9 first stage also completed its sixth successful launch and landing, underscoring SpaceX’s strategy of reusing hardware to reduce costs. The launch was the company’s 638th Falcon 9 flight since the rocket’s debut in 2010 and its 56th launch in 2026 alone, as noted by Space.com’s Mike Wall.

Cargo and Scientific Experiments

The Dragon carried a diverse payload including 1,363 pounds of crew supplies such as food and clothing, more than 1,000 pounds of vehicle hardware, 282 pounds of spacewalk components, 186 pounds of computer equipment, and 1,834 pounds of research gear and samples.

Among the scientific investigations delivered was a study examining how microgravity affects blood-making cells, or platelets, at the cellular and genetic level. NASA astronaut Jessica Meir began the experiment inside the Kibo laboratory module’s Life Science Glovebox shortly after the cargo was unloaded. Other experiments include a bone scaffold made from wood that could lead to new treatments for osteoporosis, equipment to study how red blood cells and the spleen change in space, and a project to evaluate how well Earth-based simulators replicate microgravity conditions.

NASA astronaut Jack Hathaway was the first crew member inside Dragon after docking, opening the hatch and beginning the transfer of time-sensitive research samples. The NASA ISS blog reported that the crew also activated sample tubes containing biological materials — including plant seeds, bacteria, and mold — as well as material samples such as iron and aluminum for student-designed experiments.

Significance and Broader Context

Bill Spetch, ISS Operations Integration Manager at NASA’s Johnson Space Center, highlighted the milestone: “This will be the first Cargo Dragon spacecraft to head to the station for a sixth time, so a great milestone there.” Liz Warren, Deputy Chief Scientist for the Space Station Program, noted that the ISS has enabled more than 4,000 science experiments from over 5,000 researchers across 110 countries, calling it “a truly global endeavor” that serves as a proving ground for the Artemis program and future Mars missions.

The Dragon is unique among ISS resupply vehicles as the only one capable of returning significant cargo to Earth. Other freighters — including Russia’s Progress, Northrop Grumman’s Cygnus, and Japan’s HTV-X — burn up upon reentry. The capsule is expected to remain docked for approximately one month before returning to Earth with time-sensitive research, splashing down off the coast of California in mid-June.

What’s Next for the ISS

The Expedition 74 crew continues unloading Dragon and preparing for a Russian spacewalk planned for late May. Looking ahead, the Soyuz MS-29 mission is scheduled to launch on July 14, carrying cosmonauts Pyotr Dubrov and Anna Kikina alongside NASA astronaut Anil Menon. NASA’s Crew 13 — Jessica Watkins, Luke Delaney, Canadian astronaut Joshua Kutryk, and cosmonaut Sergey Teteryatnikov — is expected to launch aboard a Crew Dragon capsule on September 12, replacing the current Crew 12. Three additional cargo flights are anticipated before the end of 2026.