- National Archives at College Park - Still Pictures
The original finding aid described this as: Description: Distant view of the External Tank (ET) as it falls away from the orbiter after separation. Ocean visible in background. Image taken by an STS-21 crewmember on the orbiter flightdeck (FD). Subject Terms: External Tank, STS-121, Separation Date Taken: 7/4/2006 Categories: ET Separation Interior_Exterior: Exterior Ground_Orbit: On-orbit Original: Digital Still Preservation File Format: TIFF.