Here's what Elon Musk will probably reveal during his big Mars colonization speech

Tech billionaire and SpaceX founder Elon Musk wants to colonize Mars with a million people in an effort to protect humanity from certain doom.

To that end, on Tuesday afternoon during a keynote talk at the 67th International Astronautical Congress in Guadalajara, Mexico, Musk will unveil his ambitious plans to establish a human settlement on the red planet.

You can watch the event live on YouTube. (There's also an embedded video player at the end of this post.)

What will Musk reveal?

He's already teased a powerful new rocket engine - but that is only one small part of what will be a challenging plan to establish a permanent colony on a nearly airless planet that's typically 140 million miles from Earth.

Here's what we can expect Musk to talk about, starting at 2:30 p.m. EDT on September 27, 2016.

Kevin Loria, Kelly Dickerson, and Jessica Orwig contributed to this post.