Four astronauts are ready to spend five days in orbit on a mission that includes the first attempted spacewalk by private astronauts.

SpaceX has scrubbed their Wednesday afternoon launch attempt of a Starlink mission. Now, 21 satellites are expected to head to low-Earth orbit tomorrow morning.

SpaceX successfully launched another batch of Starlink satellites into space from Florida on Thursday morning, after postponing the initial launch on Wednesday due to “unfavorable booster recovery conditions in the Atlantic.