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| WORD | MEANING | EXTRA INFORMATION |
| Iapetus | moon of saturn | |
| Ijiraq | moon of saturn | |
| Infrared | Invisible rays. They cannot be seen as the waves that produce them are longer than the waves at the red end of a rainbow. They can be felt though, usually as heat. | |
| Io | a | a |
| Iocaste | moon of jupiter | |
| Isonoe | moon of jupiter |
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