Space Shuttle Endeavour won’t be blasting off Friday afternoon as originally planned — the launch has been scrubbed, according to NASA’s twitter account.

The tweet came down just minutes ago, stating, “Endeavour’s launch has been scrubbed for at least 48 hours because of an issue with Auxiliary Power Unit 1 heaters.”

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President Barack Obama and Congresswoman Gabrielle Giffords, D-Ariz., were all on hand at Kennedy Space Center for what was supposed to be the last launch of Endeavour.

Check back for updates on this breaking news.