This is clearly a transition moment for the world of space.

As such, it represents that transition in space today. The next phase of space development will see the intermingling of these two trends.

We've constructed what we consider a micron-scale analog of an ox, ... These are 'micro-oxen,' a micro-scale beast of burden.

Shana is a decisive leader who will bring key policy and political skills to the front office of NASA. With strong relationships within the commercial, science, academic and policy arenas, she will play a key role in the next stage of the Vision for Space Exploration.

The highest value for oil is going to be feedstocks for chemicals, ... It's pretty much indefensible to just burn it in SUVs.

We now have an opportunity for our generation to make our mark on human history. Our parents and grandparents took us to the Moon the first time. Now it's time for us to go back to the Moon to stay, and then head straight for Mars.