JAXA, the Japanese space agency, is gearing up to launch two very different space missions from one rocket: a new X-ray telescope that will spy on some of the hottest spots in our universe, and a small experimental robotic moon lander. But the missions will have to wait until another day to get off the ground.

The telescope is called X-ray Imaging and Spectroscopy Mission, or XRISM for short (pronounced like the word “chrism”). The lunar mission is called Smart Lander for Investigating Moon, or SLIM.

XRISM and SLIM were expected to launch from an H-IIA rocket from Japan’s Tanegashima Space Centre on Sunday at 8:26pm Eastern time (or Monday at 9:26am in Japan).

The rocket was moving into its terminal countdown stage, but less than 30 minutes before the scheduled launch, JAXA announced on its webcast that the launch had been cancelled for the day “due to inclement weather . While JAXA had moments before said the weather appeared “calm”, winds at higher altitudes above the launch site were too severe for a safe launch according to a post on X (formerly known as Twitter).