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the deep impact mission was a mission to

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come at temple one to deliver an

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impactor in

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2005 the instruments on the deep impact

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spacecraft were designed to be

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diagnostic in a flyby of a comet

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we got some fascinating results from

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comet tempo one but once we got past

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temple one we had plenty of fuel left

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the spacecraft was healthy then

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immediately everybody set to work on

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figuring out what new bodies we could

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get to that's what led to the proposal

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to come go to comet hartley 2. it's

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really a good deal for for nasa and for

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the american public to send a spacecraft

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to

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a whole new mission for maybe uh a small

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fraction of what the a new mission cost

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we were able to re-target the spacecraft

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using a few flybys of earth take

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advantage of the gravity assist from

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earth to re-target ourselves change our

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trajectory just enough so that now we're

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able to get to comet hartley 2 in

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november

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because this wasn't what the spacecraft

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was planned for there's challenges and

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there's

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inevitably going to be surprises the

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geometry of the temple one flyby was

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such that we could look at the comet and

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take images at the same time that our

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high gain antenna was pointed at earth

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because of the geometry of the hartley 2

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flyby when we're pointed at the comet on

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approach our high gain antenna cannot

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see the earth so we cannot downlink data

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in real time so we have to design

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everything to

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for one thing protect that imaging

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sequence to make sure no matter what

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happens we're able to recover and keep

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taking images the things we will be

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looking for will be how different is the

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nucleus compared to the other comets

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that we've been to what does the nucleus

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look like that makes it so active can we

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see which parts of the comet are

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emitting so much gas and what's the

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nature of the chemicals the compounds

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that are coming off the comet the

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excitement about studying comets is

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really driven by getting a better

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understanding of the early phases and

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early formation of our solar system

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comets essentially have been in the

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refrigerator since the beginning of the

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solar system and so when we explore

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these objects and we find out what

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they're made of we get a look back at to

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the beginning of the formation of the

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solar system this mission is very

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economical and we're going to get