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Oh

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this is el def the long-duration

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exposure facility this school bus size

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satellite covered with samples of a

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variety of space-age materials has been

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circling the Earth since 1984 these

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samples will tell NASA what happens to

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spacecraft materials when they're

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exposed to the harsh environment of

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space for long periods like they will be

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on Space Station freedom NASA's original

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plan was to bring ldap home after about

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a year but because the shuttle fleet was

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grounded for nearly three years el def

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has now stayed in orbit five times

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longer than once expected the crew of

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the next space shuttle mission plans to

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use the orbiters remote manipulator arm

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to grab the satellite and ease it into

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the cargo bay where it will be stowed

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for the trip back to earth it will mean

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the homecoming of more than 50

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experiments and while the delay has

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meant the loss of some data on the other

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hand without a doubt the majority of the

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experiments are substantially enhanced

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by being up there the five years such is

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the case with an experiment developed by

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the University of Alabama Huntsville and

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NASA's Marshall Space Flight Center it

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measures the effects of atomic oxygen on

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surfaces at orbital altitude the same

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stuff we breathe on earth takes on a

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different form in space that literally

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erodes the surfaces of spacecraft over

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long periods of time by this

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unanticipated longer exposure the LDF

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can provide considerable beneficial

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results in terms of this studying these

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oxidation effects that kind of

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information can be extremely crucial in

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the building of a space station any

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spacecraft that's to survive for a long

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period of time in space the benefits

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from l death may be as varied as the

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experiments it carries there are even

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millions of tomato seeds up there which

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will soon be in the hands and the

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gardens of students who may be the

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scientists of tomorrow although the

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scientific homecoming may be overdue in

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one sense it will be just in time in

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another just in time that is to get as

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much exposure in space as is possible

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before L def is destroyed returning to