There's a certain amount of nervousness at present. ... It's a harsh environment out there and this is not easy. We don't really know what to expect, frankly. ... It could be anything from a crater the size of a football stadium to something that's far more modest. Or the spacecraft could simply bury itself into the comet.

Don Yeomans

Environment Present

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Sometimes, when the fragments break off, they flare up temporarily, but it usually doesn't last very long.

— Don Yeomans

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It's not gonna knock your socks off, and it certainly won't be the brightest object in the sky, but it'll be easily observable with the naked eye .

— Don Yeomans

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It looks as though some of the fragments are themselves forming their own sub-fragments.

— Don Yeomans

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The spacecraft has to be smart enough on its own to observe the comet, determine whether it's headed in the right direction, if not, make its own course correction, and then fire its thrusters to achieve that course correction.

— Don Yeomans

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We hope to get 15 centimeters resolution. That's unprecedented resolution.

— Don Yeomans