NASA is ready to make another attempt to certify its moon megarocket for spaceflight.

The agency plans to do a test of its Space Launch System (SLS) rocket core stage at NASA’s Stennis Space Center near Bay St. Louis, Mississippi, on Thursday (March 18), during a two-hour window that opens at 3 p.m. EDT (1900 GMT or 2 p.m. local time at Stennis).