The uncrewed CST-100 Starliner launched yesterday in a critical second test of the troubled commercial crew system.
Two thrusters failed to fire as expected during the spacecraft's orbital insertion burn on Thursday evening.
The most recent incident happened in March, when water began to pool inside an astronaut's helmet.
The second orbital flight test of Boeing’s Starliner CST-100 is scheduled for takeoff today at 6:54 p.m. EDT.
The DARPA-led project aims to build a constellation of military satellites in low Earth orbit.
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