Depending on how you count it, SpaceX launched its 100th kerosene-fueled Merlin 1D rocket engine on a Falcon 9 rocket Feb. 11, underscoring what it says is an accelerated flight regime for the centerpiece of the company’s propulsion shop.
Unfavorable high-altitude winds above Cape Canaveral on Tuesday kept a SpaceX Falcon 9 rocket loaded with a NOAA space weather observatory on the ground another day.