After an exciting and historic spacewalk on Thursday, September 12, the crew spent the majority of their Flight Day 4 focused on science and research. Polaris Dawn partnered with 31 institutions from across the world to create a robust and diverse science research portfolio throughout their time in space.

A few of the studies the crew has focused on since arriving on-orbit have included assessing the effects of microgravity on the human airway and veinous system in addition to examining how blood flow restriction alters blood flow in space using ultrasound and smart watches.

As humans become a spacefaring civilization, having the proper support system in the event of medical emergencies is key. The Polaris Dawn crew tested out Tempus Pro, a commercial off-the-shelf device that can collect and integrate measurements of health – including blood pressure, heart rate, respiration rate, temperature, and more – along with ultrasound imaging capabilities. The crew was able to use it to assess and compare vital sign data collected pre-flight to that collected during their time on-orbit.

The crew is also working with several partners to study the effects of microgravity on ocular health to help contribute to both preventative and post-diagnosis treatments associated with Spaceflight Associated Neurocular Syndrome (SANS), which many astronauts have experienced from their time in space. Check out the science and research video we shared earlier today to learn more about what the crew has been up to!

The crew also continued to test and demonstrate Starlink aboard Dragon. One of the biggest tests of connectivity includes the ability to quickly share files. Earlier in the week, the crew recorded Mission Specialist Sarah Gillis playing “Rey’s Theme” by John Williams on the violin. Once complete, the crew successfully sent the files down to Earth over Starlink to help create this special music event named “Harmony of Resilience.”

Teams on Earth synced Gillis’s video and audio with various recorded orchestral performances around the globe, including in Los Angeles, which was attended by legendary composer John Williams and the entire Polaris Dawn crew. These performances were conducted from mid-2023 to early 2024.

The crew wrapped their day and are gearing up for their final day on-orbit, during which more research and Starlink testing will be conducted.

Polaris Dawn Flight Day 5 Update

The crew’s final full day on-orbit was dedicated to furthering and finalizing the scientific goals of the Polaris Dawn mission, connecting with one of their training teams, and catching-up with the SpaceX family.

Two of the day’s scientific highlights focused on preventative and life-saving studies – from identifying and understanding the risk of kidney stone formation while living in microgravity to developing and validating CPR (cardiopulmonary resuscitation) procedures aboard the Dragon spacecraft.

Throughout the day, the crew continued to test Starlink, including a 40+ minute, uninterrupted video call with SpaceX teams back on Earth, which took place as Dragon orbited across the U.S. Eastern Seaboard, the Atlantic Ocean, and the Cape of Good Hope. The plaser in Dragon’s trunk and the partner Starlink satellite for the event maintained their laser link during 16 Draco thruster firings.

The crew also connected with members of the Air Force who helped train them for a week of solo skydiving at the United States Air Force Academy in Colorado.

Before settling in for their last sleep period of the mission, the crew took some time to connect with their families and began preparing Dragon’s cabin for reentry and splashdown.

Dragon and the crew are set to return to Earth and splash down off the coast of Dry Tortugas, Florida on Sunday, September 15 at 3:36 a.m. ET. Stay tuned to @SpaceX on X for a livestream of the crew’s return.