The Outer Worlds Chapter Sixteen Guiding Questions 1.
The Outer Worlds Chapter Sixteen Guiding Questions 1. How did Uranus and Neptune come to be discovered? 2. What gives Uranus its distinctive greenish-blue color?
3. Why are the clouds on Neptune so much more visible than those on Uranus? 4. Are Uranus and Neptune merely smaller versions of Jupiter and Saturn? 5. What is so unusual about the magnetic fields of Uranus and Neptune? 6. Why are the rings of Uranus and Neptune so difficult to
see? 7. Do the moons of Uranus show any signs of geologic activity? 8. What makes Neptunes moon Triton unique in the solar system? 9. Are there other planets beyond Pluto?
Uranus was discovered by chance, but Neptunes existence was predicted by applying Newtonian mechanics Uranus recognized as a planet in 1781 by William Herschel Neptunes position calculated in mid1840s because of slight deviations in
Uranus orbit Credit shared by Le Verrier and Adams Uranus is nearly featureless and has an unusually tilted axis of rotation Both Uranus and Neptune have
atmospheres composed primarily of hydrogen, helium, and a few percent methane Methane absorbs red light, giving Uranus
and Neptune their greenish-blue color Exaggerated Seasons On Uranus Uranuss axis of rotation lies nearly in the plane of its orbit, producing greatly
exaggerated seasonal changes on the planet This unusual orientation may be the result of a collision with a planetlike object early in the history of our solar system. Such
a collision could have knocked Uranus on its side Neptune is a cold, bluish world with Jupiterlike atmospheric features
No white ammonia clouds are
seen on Uranus or Neptune Presumably the low temperatures have caused almost all the ammonia to precipitate into the interiors of the planets All of these planets clouds are
composed of methane Much more cloud activity is seen on Neptune than on Uranus. This is because Uranus lacks a substantial internal heat source.
Neptunes Clouds Much more cloud activity is seen on Neptune than on Uranus This is because
Uranus lacks a substantial internal heat source Uranus and Neptune contain a higher proportion of heavy elements than Jupiter and Saturn
Both Uranus and Neptune may have a rocky core surrounded by a mantle of water and ammonia Electric currents in the mantles may generate the magnetic fields of the planets The magnetic fields of both Uranus and Neptune are oriented at unusual angles
The magnetic axes of both Uranus and Neptune are steeply inclined from their axes of rotation The magnetic and rotational axes of all the other planets are more nearly parallel The magnetic fields of Uranus and Neptune are also offset from the centers of the planets
Uranus and Neptune each have a system of thin, dark rings Some of Uranuss satellites show evidence of past tidal heating
Uranus has five satellites similar to the moderatesized moons of Saturn, plus at least 22 more small satellites Triton is a frigid, icy world with a young surface and a tenuous atmosphere Neptune has 13 satellites, one of which (Triton) is
comparable in size to our Moon or the Galilean satellites of Jupiter Triton has a young, icy surface indicative of tectonic activity The energy for this activity
may have been provided by tidal heating that occurred when Triton was captured by Neptunes gravity into a retrograde orbit Triton has a tenuous
nitrogen atmosphere Pluto and its moon, Charon, may be typical of a thousand icy objects that orbit far from the Sun Pluto was discovered after a long search Pluto and its moon, Charon, move together in a highly
elliptical orbit steeply inclined to the plane of the ecliptic They are the only worlds in the solar system not yet visited by spacecraft Several hundred small, icy worlds have been discovered beyond Neptune Pluto and Charon are part of this population
Kuiper belt magnetic axis occultation radiation darkening
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