NASA conducted its second major test of its powerful new moon rocket, and this time it only caught on fire a little bit.

The Space Launch System (SLS) Core Stage test took place late Thursday afternoon (March 18) at NASA’s coastal Mississippi test site, in a facility designed to hold the powerful machine in place while its engines fired up. The test marked the end of an eight-stage “green run” of the SLS’s main rocket that was designed to show its spaceworthiness, theoretically setting it up for an actual test launch.