A piece of practical advice to technically minded college students: if you dont know exactly what you want to do, major in the most technical degree you can handle. You can always go from a more technical degree to a less technical job (Physics degree -> engineer -> lawyer), but you it is difficult to go back the other way. Your technical degree will serve you well in your personal development as well as your future career, no matter what you end up doing.
To work on space missions that will inspire the future generations to reach for the stars.
The Mars rovers are the great explorers of the 21st Century. As Lewis and Clark did in the 19th century, the Mars Rovers are opening the frontiers of knowledge and paving the way for the future exploration of space.
I am a rocket scientist at heart, and I work on advanced electric propulsion systems (plasma thrusters) for near Earth and deep space spacecraft. Electric propulsion is flying on over two hundred spacecraft today. If you watch Direct TV or Dish network, or listen to Sirius satellite radio, you have used a spacecraft that uses electric propulsion.
A favorite quote from Latin: "Caelum certe patet; ibimus illac." translates to "The sky lies open before us, and that way we shall go."