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we're here at the Marshall Space Flight

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Center in Huntsville Alabama known for

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its long history in propulsion research

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but this NASA site is still a big player

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this time for the James Webb Space

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Telescope we're right outside the vacuum

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chamber where the mirrors for the Webb

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Space Telescope are being tested back in

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the 90s this facility was used to test

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out one of NASA's Great observatories

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the Chandra x-ray Observatory we have

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here the project scientist for Chandra

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Martin Weiskopf can you tell us a little

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bit about the differences between Hubble

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and Chandra and James Webb these are

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observatories that look at different

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parts of what we call the

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electromagnetic spectrum that is light

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at various different energies from

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x-rays where it takes a lot of energy to

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produce them to visible light where the

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Hubble Space Telescope operates and the

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near-infrared where the James Webb

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telescope will operate in this way by

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studying objects in the universe we can

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learn a lot about them that we can't

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learn by just simply looking at one

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wavelength what kind of information can

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be gleaned from x-rays x-ray astronomy

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is a system that brought the first

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discoveries of black holes in the

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universe so we look at very interesting

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astronomical objects at very great

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distances and conjunction with Hubble

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Webb will be looking to identify many

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Chandra sources that are not seen with

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Hubble now we're outside the facility

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where the mirror testing is being done

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and you can't help but see this long

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tube that is connected to the building

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itself I'm told it's almost six football

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fields long Martin what was this tube

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used for this tube is very important for

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separating the telescope that was on the

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Chandra x-ray Observatory from x-ray

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sources located at the other end of the

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building it has to be this length in

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order to make those x-ray sources appear

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like tiny stars so that we could

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determine whether our x-ray telescope

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could distinguish small objects in the

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sky why is it still here Chandra was

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tested in the mid night

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it's still here because it's very very

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useful for many programs the vacuum

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chamber is being used to test the web

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optics and we hope to be testing x-ray

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telescopes in future programs well

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thanks for your time Martin quite

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welcome the testing here for the Chandra

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Observatory ran about six months from

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1996 to 1997 then to telescope was sent

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off to be integrated with the rest of

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the observatory Chandra was launched on