We've not been able to place these brush strokes into the context of a wider canvas.

We can't tell you, for example today, what fraction of the water in the sky falls as rain and snow at any instant in time.

It's been a long journey. And the science community is absolutely excited about this, naturally, because of the new nature of these observations.

It was kind of frustrating, but everyone's relieved and really very happy this morning. It was a flawless launch.

The price of a bottle of water for every person in the United States is about what this mission will cost. Just one bottle of water. And yet the information we get about water supplies, the water cycle of the planet, I think is priceless.

We haven't seen Earth before like this, and we're going to discover new things about Earth and clouds that we've not experienced before.

We've been waiting so long . . . I'm just kind of numb at this point. The excitement will come when the data starts flowing, in May, and we see the Earth like we've never seen it before.

Clouds grossly affect the greenhouse effect on the planet. So they play a very profound role in weather and climate. Yet taken altogether they are one of the most poorly understood aspects of the climate change problem.

It provides a look at clouds somewhat analogous to a CAT Scan. It provides a kind of in-depth profile through the clouds and we can see the processes in clouds - where fresh water is created and the rain processes occur.