I've had a very interesting career. I get to do amazing things and work with amazing people and travel and learn languages - things most people don't get the opportunity to do.
We all know we have a problem, a broad problem. Ninety-eight percent of the fuel that is used by our vehicles, our autos and trucks for personal and commercial purposes, for highway and air travel operates on oil. The world has the same problem.
If interstellar travel is as time- or energy- demanding as the above figures indicate, it is far from obvious what the motive for colonization might be.
Interesting things come your way but as you get older, your lifestyle changes. I don't want to travel; I don't want to be in a hotel room away from my family.
When we see the shadow on our images, are we seeing the time 11 minutes ago on Mars? Or are we seeing the time on Mars as observed from Earth now? It's like time travel problems in science fiction. When is now; when was then?
