Moons of Jupiter
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Europa is a puzzle. The sixth largest moon in our solar system, Europa confounds and intrigues scientists. Few bodies in the solar system have attracted as much scientific attention as this moon of Jupiter because of its possible subsurface ocean of water. The more we learn about this icy moon, the more questions we have.
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The electron-impact-induced emission spectrum of H2 has been measured in the extended wavelength region 175-530 nm at a spectral resolution of 1.7 nm (FWHM).
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The Galileo spacecraft Photopolarimeter Radiometer (PPR), a hybrid visual/thermal IR instrument designed primarily to measure properties of the Jovian atmosphere, was employed for SL9 as a staring high-speed photometer at 945 and 678 nm, taking advantage of Galileo's direct view of the impact point.The PPR was able to acquire data at times when no other Galileo optical instruments could operate.
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