Today's launch will also mark the first time in history that a commercial aerospace company will carry humans into Earth's orbit, a milestone NASA and space fans have been looking forward to for almost a decade.
Update, 6:21 am AEST: Today's launch was postponed on account of weather.
As part of the Commercial Crew Program's Demo-2 mission, NASA and SpaceX will be launching the Crew Dragon Capsule for its first manned flight.
The launch will take place at Florida's Kennedy Space Center, and it's scheduled for just after 4:30 p.m.
Crews had begun to fuel the Falcon 9 rocket carrying the capsule before the decision was taken to cancel due to cloudy skies and rain.
NASA astronauts Robert Behnken and Douglas Hurley will fly on SpaceX's Crew Dragon spacecraft, lifting off on a Falcon 9 rocket this evening for a stay on the space station for the Demo-2 mission. That means it will begin offering regular transportation services for astronaut crew to and from the International Space Station, joining Russia's Soyuz as a means to travel to the orbital science platform.
In press briefings, Behnken and Hurley said they'd been tested twice for COVID-19 and expected to be tested one final time before launch. Actually, you'll be able to watch it live on ABC, the National Geographic Channel, as well as on Hulu, Roku, Sling TV, Facebook, Twitter, YouTube TV, Apple TV, and Amazon's news app on Fire devices and Fire TV.
In the event the launch is scrapped due to weather, backup dates and times have been scheduled for Saturday, May 30, at 2:22 p.m. CDT, and Sunday, May 31, at 3:00 p.m. CDT.