Nasa's Pegasus barge that will carry fuel tanks for the Space Launch System to other NASA facilities for testing and launches. More Info: NASA Infographic: https://www.nasa.gov/exploration/systems/sls/multimedia/barge-pegasus-infographic Pegasus Barge Fact Sheet: https://www.nasa.gov/sites/default/files/atoms/files/sls_pegasus_fact_sheet_508_final_04212017.pdf
Note:You may be interested in my photos from my visit to the NASA Michoud Assembly Facility..
