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In diameter stretched out, but is made out of thin film poly. and this is what we're seeing the pictures of this balloon from china. so it looks like it isn't being floated on a traditional weather balloon, but on a research or high altitude military balloon. so what would this balloon consist of, john? well, the balloon itself is just a polyethylene film. you know, if you have yourfood wrap film and you have something about ten times thinner, and that is holding your big ball of helium that is holding the balloon up. below it is the instrument package. from what we can see there are solar pan...

As you can see from that image in my background, the mirror is not one single mirror. it's 18 segments, all hexagonal and we can fold the edge elements around the side of the telescope and the instrument package so that it fits. so that's a very new approach to d doing this. >> just fascinating. this was first imagined, i was reading, as a successor to hubble in '89. this took thousands of scientists, technicians, engineers, 14 countries, i think i saw, to build this. what does this launch represent? >> so i think this launch remits a lot of things. first of all, it's a technological marvel. w...

Information on how to assemble a low-cost, closed-loop atomic force microscope using a scanning probe microscopy kit.