Link here. The article outlines from a different perspective the many problems faced by NASA’s Artemis program, specifically related to its SLS rocket.
First, that fourth Artemis mission will require a larger first stage, which is far behind schedule and should not be ready until late 2028 (though I predict at least one to two years beyond that date).
Second, that larger upper stage will require completion of a new mobile launcher platform, replacing the mobile launcher now in use that cost about a half billion and will only be used three times. The new launcher platform however is also behind schedule and overbudget. Its completion is not expected until 2027 (though I predict at least one year beyond that date).
Thus, even if the third Artemis mission flies in 2026, as presently scheduled, it will be at least two years before the fourth can fly, but more likely the gap will be three to four years.
Everything related to NASA’s SLS rocket is a mess. If the people running our government had brains, they would immediately dump it and do everything they can to speed development of Starship/Superheavy, which has a better design, is reusuable, is more powerful, has greater capabilities, and most important of all, will be able to fly frequently and quickly at a very low cost, something that SLS will never be able to do.
Unfortunately, the people running our government have no brains, or to be more precise, refuse to use them because of their own selfish petty interests. SLS will go on, wasting billions. And the effort to squelch Starship/Superheavy will also continue, because these petty federal officials can’t have a private company show them up. No way! It must be their way, or the highway!