The Space Launch System (SLS) is a large (8.4m diameter) heavy-lifting launch rocket in development by NASA, aimed at launching spacecraft such as telescopes and planetary probes, potentially including manned missions. As such, it is an alternative to current and previous such rockets such as the Atlas, Delta, and Ariane series. Multiple versions and upgrades are planned, including a version would set a new record for lifting power, currently still held by the Saturn V.
The SLS borrows technology from the Space Shuttle, including the rocket engine design. Current plans have the first launch in 2020.