'A giant leap': Why a tech billionaire's climb outside a spacecraft was so historic

KENNEDY SPACE CENTER — SpaceX's Polaris Dawn crew is beginning its fifth day in orbit, having marked a few record-setting milestones on a historic journey — including the world's first commercial spacewalk. Conducting a spacewalk is nothing new. NASA has been carrying out the endeavors in outer space since 1965, when the Gemini program debuted the capability for the United States. Since then, astronauts from all over the world have used spacewalking technology to explore the moon's surface, service the Hubble Space Telescope and help construct the International Space Station....