Elon Musk: tech dreamer reaching for sun, moon and stars

Sending tourists for a trip around the moon is the latest big idea launched by Elon Musk, a Silicon Valley star known for turning his passions into visionary enterprises.Musk has become one of the United States' best-known innovators.SpaceX recently announced that two private citizens have paid money to be sent around the Moon in what would mark the farthest humans have ever traveled to deep space since the 1970s.