Polaris Dawn is aiming for the first civilian spacewalk on an ambitious mission launching no earlier than Aug. 26.
Four astronauts will fly to Earth orbit aboard a SpaceX Crew Dragon capsule, which will launch from NASA's Kennedy Space Center in Florida atop a Falcon 9 rocket. Polaris Dawn crewmembers will make the first private spacewalk and circle Earth at an altitude of 435 miles (700 kilometers), the highest altitude since the Apollo missions.
