While this may look like a futuristic tunnel to another world, it is really looking up inside a nearly complete fuel tank for NASA’s powerful, new rocket—the Space Launch System—that will take humans to destinations never explored by people before. At over 300-feet tall and 5.75 million pounds at liftoff, SLS needs plenty of fuel to leave Earth. Once a final dome is added to the liquid hydrogen rocket fuel tank, shown here, it will come in at 27.5-feet in diameter and over 130-feet long, making it the largest major part of the SLS core stage (the "backbone" of the rocket). (NASA/Michoud/Steven Seipel) #sls #exploredeepspace #spacetech #rocket