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20 October, 07:20

What leads astronomers to believe that some large moons associated with the giant planets have compositions that are roughly half water?

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  1. 20 October, 07:38
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    Astronomers are able to determine facts about the composition of these moons by examining the nature of light that is reflected from their surfacy using a method called spectroscopy. This process works because different materials tend to reflect light at different wavelengths So, by observing at which wavelengths a planetary body reflects light, astronomers are able to estimate its composition.
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