LOS ANGELES — SpaceX Chief Executive Elon Musk on Tuesday unveiled his plans for colonizing Mars, which could eventually involve a fleet of up to 1,000 spaceships to transport as many as 1 million people to the Red Planet. Musk envisions continuous launches from Earth, with massive rockets returning for reuse and spacecraft refueling in a… Continue reading Elon Musk unveils plans for colonizing Mars →