Op/Ed: It’s time to forget the space shuttle and head for Mars Alameda Times-Star

The images of the space shuttles Challenger and Columbia disappearing against bright blue skies stunned America and the world. Twice in recent history we’ve had to confront the reality that placing humans in space is terrifically risky as well as expensive. Twice we’ve had to ask the question: Is what we’re doing in space worth dying for? Both times we’ve ducked the question.