SpaceX successfully launched the SES O3b mPOWER mission from Central Florida to medium-Earth orbit Tuesday afternoon.

To feed these liquids into the engines, Falcon 9 uses helium to pressurize both the LOX and RP-1 tanks, particularly as fuel ...

7 minutes: Falcon 9 begins engine chill prior to launch. 1 minute: Command flight computer begins final prelaunch checks; propellant tank pressurization to flight pressure begins. 45 seconds ...

The Falcon 9 booster was launched in 2015 but after completing its mission, the second stage did not have enough fuel to return towards ... a four-tonne empty metal tank, with a rocket engine ...