Yes, 4,000 pounds of dirty laundry are burning in space. Okay, it's not the whole craft since more experiments will be conducted with the same spacecraft.
Speaking of the mission, David Urban, SAFFIRE’s principal investigator, stared:
In spacecraft, we’ve never had the opportunity to burn anything larger than approximately an index card…We really don’t know what the fate of a fire is. So our building of future spacecraft is based on one-G understanding and extrapolation of very small, short-duration experiments.
Better now as an experiment than later as an event.
