SpaceX Dragon Splashes Down in Pacific Ocean

A camera on the tip of the Canadarm2 robotic arm views the SpaceX Dragon as it separates from the International Space Station. (Credit: NASA)

HOUSTON (NASA PR) — The SpaceX Dragon spacecraft splashed down at 10:42 a.m. in the Pacific Ocean about 271 miles southwest of Long Beach, California, marking the end of the company’s 19th contracted cargo resupply mission to the International Space Station for NASA.

A key component being returned aboard Dragon is a faulty battery charge-discharge unit (BCDU), which failed to activate following the Oct. 11 installation of new lithium-ion batteries on the space station’s truss. The BCDU was removed and replaced during a spacewalk Oct. 18 by Expedition 61 flight engineers Christina Koch and Jessica Meir of NASA. The unit are being returned to teams on Earth for an evaluation and repair.

Some of the scientific investigations Dragon returned to Earth include:

Tiny Radiation Resistors

Rotifer-B1 examines the effects of spaceflight on tiny aquatic animals, called rotifers, which are found in freshwater ecosystems and soil and are highly resistant to radiation on Earth. The investigation specifically looks at the metabolism and genome of the rotifer Adineta vaga to determine whether they have similar adaptation mechanisms in microgravity.

Mice in Space

Rodent Research-19 examines myostatin and activin, molecular signaling pathways that influence muscle degradation, as possible targets for preventing muscle and bone loss during spaceflight and enhancing recovery following return to Earth. This study also could support the development of therapies for a wide range of conditions that cause muscle and bone loss on Earth.

Finding the Perfect Solution

On Earth, our bodies deal with low-level radiation through a naturally occurring protein that helps our body safely process it. The Growth of Large, Perfect Protein Crystals for Neutron Crystallography (Perfect Crystals) study, aims to help scientists find a way to deal with the problem of radiation during long-duration spaceflight missions using the same protein that is already at work in our bodies.

Convection and Crystallization in Microgravity

The Polymer Convection study examines the effects of gravity on formation and crystallization of Broadband Angular Selective Material (BASM), an optical material with the ability to control the reflection and absorption of light. BASM has applications in polymer packaging, optical films, solar power and electronic displays.

These are just a few of the hundreds of investigations providing opportunities for U.S. government agencies, private industry, and academic and research institutions to conduct microgravity research that leads to new technologies, medical treatments and products that improve life on Earth. Conducting science aboard the orbiting laboratory will help us learn how to keep astronauts healthy during long-duration space travel and demonstrate technologies for future human and robotic exploration beyond low-Earth orbit to the Moon and Mars.

Dragon launched on the SpaceX Falcon 9 rocket Dec. 5 from Space Launch Complex 40 at Cape Canaveral Air Force Station in Florida, and arrived at the station two days later with almost 3,400 pounds of science, supplies and cargo.

Learn more about station activities by following the space station blog, @space_station and @ISS_Research on Twitter as well as the ISS Facebook and ISS Instagram accounts.