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Ch13 Uranus&Neptune2
Vocabulary
Term | Definition |
---|---|
Magnetic Axis | plane through a planet where the magnetic field lines intersect at the surface |
Dynamo | rotating, conducting material flowing in an object's interior producing a magnetic field |
Slush | slurry mixture of small ice crystals and liquid |
Miranda | smallest round moon of Uranus with the tallest known cliff in the solar system |
Umbriel | darkest of Uranus' large moons |
Titania | Uranus' largest moon |
Radiation Darkening | solar energy slowly causes a dark hydrocarbon layer to build up on an icy surface |
Triton | Neptune's largest moon with a retrograde orbit, nitrogen geysers, and ice volcanoes |
Retrograde Orbit | some moons of the outer planets orbit backwards (clockwise) |
Nereid | third-largest moon of Neptune; has the most eccentric orbit of any moon in the solar system |
Eccentric | flat elliptical orbit of an object |
Geyser | when liquid intermittently boils, sending a tall column of it and steam above the surface |
Ice Volcano | upwelling of hot semifluid material from below the crust to the surface |
Stellar Occultation | dimming of starlight when an object passes directly in front of a star |
Planetary Ring System | material organized into thin, flat rings encircling a planet's equator |
Ring Segments | narrow region in a planetary ring system where the density of ring particles is high |
Shepherd Moon | satellite whose gravity on a ring helps preserve its shape |