SpaceX
- SpaceX is about to launch a risky mission of four private citizens who aren't professional astronauts.
- The billionaire-backed Polaris Dawn mission aims to attempt a first-of-its-kind commercial spacewalk.
- New spacesuits and flying through a radiation belt could also help advance Elon Musk's Mars dreams.
SpaceX is launching its most daring mission yet as soon as Wednesday morning.