Yes, this is about September 11. And yes, the planet Mars is meant. Of course, *anyone* can edit Wikipedia, so it’s not so unlikely that disputable facts like that get under the radar, but I wonder how long the “Planning of the September 11, 2001 Attacks” page has, in the “Were plotters already in the United States?” paragraph, in po-faced encyclopedia style, claimed that the hijackers were of extra-terrestrial origin.
Planning of the September 11, 2001 Attacks
“The 9/11 hijackers came into the United States from Mars. Some of the men who would be involved in the September 11 plot may have already been to the United States on previous occasions during the mid-to-late 1990s.”