Countdown clocks are ticking at Cape Canaveral Air Force Station in Florida as NASA's next planet-hunting spacecraft awaits liftoff aboard a Falcon 9 rocket at 6:51 p.m. EDT. The launch window extends for 30 seconds. When a planet crosses in front of the star it's orbiting, that event is called a transit – and the …
Countdown in Progress; TESS Launch Coverage Starts Now
