Update: As of July 20, NASA says it is holding three placeholder dates for possible launch targets: August 29 between 8:33 a.m. and 10:33 a.m. ET, September 2 between 12:48 p.m. and 2:48 p.m. ET, and September 5 between 5:12 p.m. and 6:42 p.m. ET. Mission duration would be 42 days, 39 days, and 42 days, respectively.

NASA conducted its fourth wet dress rehearsal attempt for its Space Launch System rocket this week, completing a critical trial run at fueling the rocket mostly without issue. Officials were uncertain one day after the test if the Moon rocket would require another round of fueling. The agency has since communicated that it intends to launch SLS as early as last August without a fifth go at working out the kinks during fueling.