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we are wrapping up the last of the

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vehicle tests and get ready to make it a

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it's going to be a big push but that's

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kind of how the end game goes we try to

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get things ready and every last thing

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has to be done and done right it takes a

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we have a lot of work to do in the next

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two months because although the vehicles

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in Florida and we we've stacked it

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together just in the last couple of days

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the rover's got its rocket jetpack on it

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and the jetpack and the rover together

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has been put in the back shell of the

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vehicle and we're right now we're

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putting the cruise stage on top in some

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sense that process is actually pre

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straightforward the challenge we have

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here in Pasadena is finishing up all our

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testing all of our testing on it in our

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test bed and on the equipment and going

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through and looking all the problems we

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had on our chest program make sure that

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that all the problems we found we're all

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solved and that we know what we're going

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everyone stand by testing is a lot like

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renovating your house you can enumerate

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some very large obvious things to do and

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then when you do them it becomes clear

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that there are some second-order

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secondary things to do and then when you

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do those you discover a third order

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fourth order ad infinitum we require our

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system to be able to be robust to

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survive a number of different kinds of

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faults both internal faults things

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breaking on the spacecraft or loss of

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Sun data coming into the Sun sensor a

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variety of unfortunate circumstances we

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try to make our design robust to not

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only be driven the rover we've moved its

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arm she put us all through its paces but

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it's been in the thermal vacuum chamber

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and kept very cold if parts of it have

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been on through an ascent of huge we've

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done drop tests pull tests and drive

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tests load test stress tests it's just

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amazing amount of testing this vehicle

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have gone through we've done shorting

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tests we've taken the vehicle and

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shorted electronics we've looked to see

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that the radios all work together and

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that the rover doesn't interact with

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itself in bad ways we've tried every way

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of operating in the vehicle using the

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software literally thousands and

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thousands of hours of software testing

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it's been just a amazing civil gears

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really a constant testing and

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development finding problems fixing

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those problems and going on to the next

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the system is sufficiently complex that

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anything you change has to be done with

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great care and caution and then tested

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thoroughly because of the potential for

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side effects unintended consequences of

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the fix the first rule of engineering

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this late in the game is do no harm this

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is a very very complicated Beast this is

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by far the most complex thing we've ever

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built

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it's almost hard to imagine how complex

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it is and in fact if you get it get

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close up to the vehicle you can see the

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richness of detail and in fact this

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vehicle almost has fractal like

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complexity the more you look at it the

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more details that you uncover and yet to

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make sure when you're building this

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thing and testing and designing it that

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those interactions are well understood

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and that you and that there is nothing

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about the system that will will

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interfere with itself and this has been

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a real challenge we've had and so every

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minute of the time we've had we've been

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using that time with incredible

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intensity so hopefully we'll take a big

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breath in in mid-november before we

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launch enable relax and let her let this