Another SpaceX Falcon 9 rocket rocket launch was attempted on Saturday, with a payload of 10 satellites to put into low-Earth orbit for the Iridium satellite communications company. I am sure the countdown was more nerve-wracking than usual for the engineers and executives, given the rocket explosion in Sept. of last year*. Anyway, the launch from Vandenberg Air Force Base in California went very well, and as an added bonus, the spent rocket was successfully landed on a drone shop for re-use! Check out the webcast here.
*The Falcon 9 rocket exploded on the launch pad while being fueled for a test fire. The cause? The liquid oxygen propellant froze into a solid while being fed into the tank, which also had liquid helium cylinders, kept at minus 269 °C. (That is only 4 °C above the fantastically cold, coldest temperature that is physically possible; a temperature called absolute zero : minus 273.15 °C).