We’ve made it all the way to the moon. We’ve got a space station in orbit. Why haven’t we been able to take a trip to our closest neighbor, Mars? Tonight, “Tech Live” takes a look at what’s the trouble with space travel these days. First, what does Mars really look like? Popular culture has a vision of what it’s like, as seen through books and films such as “Red Planet” and “Mission to Mars.” And we’ve all seen the view from NASA’s Pathfinder robot, which landed on Mars in 1997. The planet looks red and dusty. But what does the red planet look like first hand? We have no idea, because nobody’s ever been there. And some wonder if we’ll ever make it, considering Americans’ blas