This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
Photo attributed to Yinan Chen. This file has been released explicitly into the public domain by its author, using the Creative Commons Public Domain Dedication. No endorsement implied.
Photo attributed to Author Ellen Murphy / Roy Smith. This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. Subject to disclaimers. No endorsement implied.
Photo attributed to Walter Siegmund. This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. No endorsement implied.
This image or file is a work of a U.S. Air Force Airman or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image or file is in the public domain in the United States.
