When we sit down to draw or paint the sun's rays, we generally use yellow because in the morning and the evening with the blue light scattered away so strongly you're left with a little bit of red and it comes out yellowish.

The US Navy has several people on every ship that can navigate by the stars. They don't fool with that.

People that don't want to get down to the business at hand. Instead of just doing less, we have to find ways of doing more with less. That's the key to the future.

Winter lingered so long in the lap of Spring that it occasioned a great deal of talk.

Evolution is not something you can believe in or not believe in like do you believe in gravity.

NASA is an engine of innovation and inspiration as well as the world's premier space exploration agency, and we are well served by politicians working to keep it that way, instead of turning it into a mere jobs program, or worse, cutting its budget.

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?