![Up, Up and Away](https://www.nasa.gov/wp-content/uploads/2023/03/126041main_image_feature_395_ys_full.jpg)
Up, Up and Away
When scientists need longer exposure times in high altitudes, they use scientific balloons like the one pictured here. Made of a super-thin polyethylene, the balloons are filled with inert helium and can be launched from almost anywhere, staying aloft for as long as 24 hours, 26 miles above the surface.
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https://www.nasa.gov/image-detail/up-up-away-2/
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