The launch of NASA and SpaceX's Crew-12 mission to the International Space Station has been delayed to no earlier than Friday, Feb 13. Here's why.

The quartet's arrival will take the ISS back up to its normal complement of seven crewmembers. The station has been staffed by just three astronauts — one American and two Russians — since Jan. 15, when SpaceX's Crew-11 mission departed for Earth.

For Florida rocket launches, there's typically a rumble that follows after liftoff. Sometimes windows shake in areas closest to NASA or Cape Canaveral

The Launch Readiness Review is GO for Thursday's liftoff of the United Launch Alliance Vulcan rocket on a U.S. national security mission, known as USSF-87.