It will rewrite the science textbooks on Mars.

They're bringing their data back, we think, through a straw. We're going to start opening up the fire hose ... We're going to be awash in data that will allow us to better understand the planet as a whole.

This is obviously the critical maneuver. We will not see the end of the burn.

Oh I am very relieved. It was picture perfect.

We have a tremendous amount of anxiety and concern. At the same time, I feel confident. We have a very good spacecraft that has been performing extraordinarily well. We have an excellent well-trained team that's ready to go forward.

Each time you dip into the atmosphere, you have to be very attentive because if you dip in too far ... it can be detrimental to the spacecraft, ... We have an atmosphere we don't fully understand. ... There are a lot of people who lose a lot of sleep.

We're on the money right now. But we are getting into the dangerous portion of the mission. A lot can go wrong, and if we don't succeed, we will fly right by the planet.

We have a tremendous amount of anxiety and concern at this particular point in time.