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Massive explosion rocks SpaceX Texas facility, Starship engine in flames
(interestingengineering.com)
This is a most excellent place for technology news and articles.
Test Pad, it was on a test pad.
The reason they use test pads is that iPads are too expensive.
No, it was a test stand at the McGregor rocket testing facility, it wasn't even at Boca chica (the place where all the finished rockets are launched from). This is not a big deal and won't affect their schedule at all.