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 will launch 21 Starlink satellites, including 13 with direct-to-cell capabilities, into low-Earth orbit on Thursday.