CAPE CANAVERAL -- The two-day countdown to launch of NASA’s first Space Launch System (SLS) rocket began as scheduled on Aug. 27, with no technical issues and a 70% chance of acceptable weather for ...

CAPE CANAVERAL—After more than 30 countdown simulations, two core-stage Green Run static engine firings and four launchpad wet dress rehearsals, countdown clocks at Kennedy Space Center were scheduled ...

The prospect of armed conflict extending into orbit has shifted from science fiction to a concrete concern for defense planners and diplomats. Multiple governments are now building or testing tools ...

Fresh off repairs at the launch pad in Florida, United Launch Alliance engineers restarted the countdown overnight for the third attempt to send an Atlas V rocket and Boeing’s Starliner spacecraft on ...