SLS: First view of Nasa's assembled 'megarocket'
Over Friday and Saturday, teams at Kennedy Space Center used a heavy-lift crane to first hoist the core stage, transfer it from a horizontal to a vertical position, and then lower it into place between the SRBs on a structure called the mobile launcher.
https://www.bbc.com/news/science-environment-57446686?utm_source=tldrnewsletter