NASA’s six-year trip to the asteroid belt will have to wait at least one more day as mission managers called off the planned Thursday launch of a SpaceX Falcon Heavy carrying the Psyche probe.

Space Launch Delta 45’s weather squadron only gave Thursday a 20% chance for good launch conditions, which will improve to 50% if delayed until Friday.

Now NASA and SpaceX will aim for a 10:19 a.m. liftoff from Kennedy Space Center’s Launch Pad 39-A. There are daily launch opportunities for the mission that run through Oct. 23, but weather has only a 50% chance through Saturday as well as the state deals with a fluctuating frontal system.

Falcon Heavy is making only its eighth flight ever, and two of its three boosters will be headed back to land at nearby Cape Canaveral Space Force Station with the pair bringing the sonic booms that come with reentry that can be heard across parts of Central Florida as they head for Canaveral’s Landing Zone 1 and 2 about eight minutes after takeoff.

SpaceX Falcon Heavy set for 1st NASA launch to explore mysterious asteroid Psyche

The Psyche satellite is heading to what scientists think is a metal-rich asteroid also named Psyche. It’s one of only nine known such asteroids out of more than 1 million known asteroids, and by far the biggest.

Scientists think it might be the core of what was once a small planet that was somehow shredded of its outer layers. They see it as potentially revealing just what makes up the core of rocky planets including Earth, and hope to unlock secrets of planetary formation.

The launch will send the probe on a 2.5 billion mile journey that includes a slingshot gravity assist around Mars for an arrival to the asteroid in 2029 where it begin a 26-month investigation.