Propellant leak blamed for Falcon 9 upper stage uncontrolled reentry

SpaceX said that a Falcon 9 upper stage that reentered over Europe earlier this week suffered a propellant leak that prevented it from doing a controlled reentry. The upper stage was placed in orbit on a Feb. 1 launch from Vandenberg Space Force Base in California. After deploying its payload of 22 Starlink satellites on the Group 11-4 mission, the upper stage was expected to perform a burn to enable a controlled reentry over the ocean, a standard procedure on most Falcon 9 launches to low Earth orbit. More

(Source: SpaceNews - Feb 25)