The NASA TRACERS mission is set to launch on Wednesday atop a SpaceX Falcon 9 rocket after SpaceX postponed Tuesday's launch due to "airspace concerns."

One of these ride-along NASA efforts is the Athena EPIC (Economical Payload Integration Cost) SmallSat, which will demonstrate a new way of more efficiently placing remote-sensing (or rather, Earth-observing) instruments into orbit.

SpaceX is waiting for better weather in the splashdown zone where the crew will end its five-day mission. SpaceX again delays launch of historic commercial mission. Story by William Harwood

Three launch delays so far, 1 for a helium leak. The delay is the third since the Polaris Dawn crew arrived in Cape Canaveral to make the final preparations for the mission.

NASA has elected to find new sealant material to address helium leaks and explore several hardware changes to deal with what was determined to be overheated thrusters.

This 24-hour delay will allow time for SpaceX technicians at the company's launch facility, known as Starbase, to replace a component on the rocket's stainless steel Super Heavy booster.

SpaceX was targeting a Wednesday 3:38 a.m. EDT liftoff of Falcon 9's Polaris Dawn to low-Earth orbit from NASA's Kennedy Space Center in Florida, but canceled the launch Tuesday night due to ...

SpaceX Starship Launch Delay ‘Necessary,’ FAA Administrator Tells Congress Agency leader Mike Whitaker fields questions about the delayed fifth flight of SpaceX’s massive Starship rocket.

SpaceX has again delayed the launch of a rocket carrying four private astronauts to space, part of a groundbreaking mission aimed at performing the world’s first commercial spacewalk.

The Federal Aviation Administration said a regional power outage disrupted telecommunications at the Los Angeles Air Route Traffic Control Center, which forced postponing of the SpaceX Falcon 9 TRACERS launch on Tuesday.