They are now scrubbed. They cleared a booster issue and are now examining a Starship issue. They had a solution submitted and are waiting for a decision. Pressure was too low. They will destack and figure it out.
This is the eighth fully integrated test flight of Starship with its Super Heavy booster, the largest and most powerful rocket to ever fly. This is the second launch of the new Starship upper stage with many tweaks, bringing it closer to full functionality.
If all goes well, Starship will softly splashdown in the Indian Ocean about 66 minutes after it lifts off from Starbase, TX, having performed a Raptor relight test and deploying 4 Starlink mass simulators. SpaceX will hopefully be attempting to catch the Super Heavy booster with the launch tower again, which would be the third catch of the booster.
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https://www.theverge.com/news/618529/spacex-faa-nasa-starship-super-heavy-booster-explosion-upgrades
SpaceX Has Finally Figured Out Why Starship Exploded, And The Reason Is Utterly Embarrassing.
If it was just low spin start pressure there wouldn’t be a need for destacking though…
It wasn’t just low spin start pressure. They had a list of things they needed to check out since they missed their flight window.