SpaceX has had monthly test launches every month for the past three months.
The Space Launch System (SLS) program started in 2011. They have never launched. The first launch has been delayed over five years. The first launch will not be made in 2021 and is sliding into 2022 and possibly later. The SLS program has spent about $20 billion.
SpaceX will up the test candence towards weekly launches later in 2021. This will likely start speeding up after two more test launches and all of the landing problems are resolved.
The current status of SpaceX's Starship & Superheavy prototypes. 5th March 2021 pic.twitter.com/eFr6ZkqVnV
— Brendan (@_brendan_lewis) March 5, 2021
Wooh! Lots of new info on this diagram now along with some great photos to go along with it. Any suggestions for the next version? pic.twitter.com/adw9b1prT1
— Artzius (@artzius) February 27, 2021
SOURCES- Brendan_Lewis, Artzius, Wikipedia
Written by Brian Wang, Nextbigfuture.com