The SLS Core Stage is a large 1st stage rocket that is the first stage of the SLS(Space Launch System). All boosters in the game can connect to it, and its size is unmatched by any other part in the current version of Space Agency. It is much more effective when you attach the SLS Advanced Boosters or the SLS Solid Boosters to it.
- The SLS Core Stage is unlocked in Mission 22.
- This rocket is being designed by NASA to get humans to Mars or beyond.
- This is the tallest stage in the Large Parts menu.
- Before version 1.8.0, the percentage of the SLS Core Stage's fuel had marked "92%". It had been changed to "74%", making it more difficult for going to space.
- It is able to reach orbit on its own or with a payload if fuel-saving techniques are used.