Polaris Dawn, an ambitious all-civilian spaceflight, is scheduled to liftoff Tuesday.

When the mission commences with the launch of a SpaceX Dragon capsule, four private astronauts will rocket into the upper reaches of Earth's orbit, where they will conduct the first-ever commercial spacewalk, among other things.

The mission has the potential to be a historic one - and not just because of the many firsts that billionaire entrepreneur Jared Isaacman's crew hopes to accomplish. A successful mission would also be a crucial step in laying the groundwork for future deep space exploration as NASA and other space agencies set their sights on destinations like Mars.

Isaacman, the man behind 2021's Inspiration4, the mission that became the first-ever private orbital spaceflight, helped bankroll Polaris Dawn along with Elon Musk's SpaceX.

The mission, which was initially scheduled to launch early Monday before a 24-hour delay, still has the potential to be scrubbed due to factors such as poor weather conditions or unexpected issues with the spacecraft. If everything goes to plan, here's how to watch it.

Polaris Dawn: SpaceX is about to launch a billionaire and 3 others into orbit on civilian mission

When is the Polaris Dawn launch?

After arriving last week at NASA's Kennedy Space Center in Florida, the four-member crew of Polaris Dawn are scheduled to embark on their Earth orbit mission as early as Tuesday.

The SpaceX Crew Dragon capsule that will carry them into orbit will lift off atop a Falcon 9 rocket. SpaceX is targeting a 3:38 a.m. liftoff, but the launch window lasts until 7 a.m. should delays arise, according to NASA.

If needed, backup launch times are available at the same times on Wednesday.

FLORIDA TODAY, part of the USA TODAY Network, will also provide live coverage starting about two hours before liftoff at floridatoday.com/space.

The Polaris Dawn planned orbit schedule

Contributing: Rick Neale, Florida Today