3. The planet Uranus is also known as a-
(a) windy planet
(b) terrestrial planet
(c) jovian planet
(d) red planet
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This article is about the planet. For other uses, see Uranus (disambiguation).
Uranus is the seventh planet from the Sun. Its name is a reference to the Greek god of the sky, Uranus, who, according to Greek mythology, was the grandfather of Zeus (Jupiter) and father of Cronus (Saturn). It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both have bulk chemical compositions which differ from that of the larger gas giants Jupiter and Saturn. For this reason, scientists often classify Uranus and Neptune as "ice giants" to distinguish them from the other gas giants. Uranus's atmosphere is similar to Jupiter's and Saturn's in its primary composition of hydrogen and helium, but it contains more "ices" such as water, ammonia, and methane, along with traces of other hydrocarbons.[16] It has the coldest planetary atmosphere in the Solar System, with a minimum temperature of 49 K (−224 °C; −371 °F), and has a complex, layered cloud structure with water thought to make up the lowest clouds and methane the uppermost layer of clouds.[16] The interior of Uranus is mainly composed of ices and rock.[15]
Uranus
Uranus symbol.svg
Uranus2.jpg
Photographed as a featureless disc by Voyager 2 in 1986
Discovery
Discovered by
William Herschel
Discovery date
13 March 1781
Designations
Pronunciation
/ˈjʊərənəs/ (About this soundlisten) or /jʊˈreɪnəs/ (About this soundlisten)[1][2]
Named after
the Latin form Ūranus of the Greek god Οὐρανός Ouranos
Adjectives
Uranian /jʊˈreɪniən/[3]
Orbital characteristics[9][a]
Epoch J2000
Aphelion
20.11 AU
(3008 Gm)
Perihelion
18.33 AU
(2742 Gm)
Semi-major axis
19.2184 AU
(2,875.04 Gm)
Eccentricity
0.046381
Orbital period
84.0205 yr
30,688.5 d[4]
42,718 Uranian solar days[5]
Synodic period
369.66 days[6]
Average orbital speed
6.80 km/s[6]
Mean anomaly
142.238600°
Inclination
0.773° to ecliptic
6.48° to Sun's equator
1.02° to invariable plane[7]
Longitude of ascending node
74.006°
Time of perihelion
2050-Aug-19[8]
Argument of perihelion
96.998857°
Known satellites
27
Physical characteristics
Mean radius
25,362±7 km[10][b]
Equatorial radius
25,559±4 km
4.007 Earths[10][b]
Polar radius
24,973±20 km
3.929 Earths[10][b]
Flattening
0.0229±0.0008[c]
Circumference
159,354.1 km[4]
Surface area
8.1156×109 km2[4][b]
15.91 Earths
Volume
6.833×1013 km3[6][b]
63.086 Earths
Mass
(8.6810±0.0013)×1025 kg
14.536 Earths[11]
GM=5,793,939±13 km3/s2
Mean density
1.27 g/cm3[6][d]
Surface gravity
8.69 m/s2[6][b]
0.886 g
Moment of inertia factor
0.23[12] (estimate)
Escape velocity
21.3 km/s[6][b]
Sidereal rotation period
−0.71833 d (retrograde)
17 h 14 min 24 s[10]
Equatorial rotation velocity
2.59 km/s
9,320 km/h
Axial tilt
97.77° (to orbit)[6]
North pole right ascension
17h 9m 15s
257.311°[10]
North pole declination
−15.175°[10]
Albedo
0.300 (Bond)[13]
0.488 (geom.)[14]
Surface temp. min mean max
1 bar level[15] 76 K (−197.2 °C)
0.1 bar
(tropopause)[16] 47 K 53 K 57 K
Apparent magnitude
5.38[17] to 6.03[17]
Angular diameter
3.3″ to 4.1″[6]
Atmosphere[16][19][20][e]
Scale height
27.7 km[6]
Composition by volume
(Below 1.3 bar)
Gases:
83 ± 3% hydrogen (H
2)
15 ± 3% helium (He)
2.3% methane (CH
4)
0.009% (0.007–0.015%) hydrogen deuteride (HD)
hydrogen sulfide (H
2S)[18]
Ices:
ammonia (NH
3)
water (H
2O)
ammonium hydrosulfide (NH
4SH)
methane hydrate
Like the other giant planets, Uranus has a ring system, a magnetosphere, and numerous moons. The Uranian system has a unique configuration because its axis of rotation is tilted sideways, nearly into the plane of its solar orbit. Its north and south poles, therefore, lie where most other planets have their equators.[21] In 1986, images from Voyager 2 showed Uranus as an almost featureless planet in visible light, without the cloud bands or storms associated with the other giant planets.[21] Voyager 2 remains the only spacecraft to visit the planet.[22] Observations from Earth have shown seasonal change and increased weather activity as Uranus approached its equinox in 2007. Wind speeds can reach 250 metres per second (900 km/h; 560 mph).[23]
History
Orbit and rotation
Physical characteristics
Climate
Formation
Moons
Exploration
In culture
See also
Notes
References
Further reading
External links
Last edited 22 days ago by CielProfond
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Answer:
(a) windy planet
Explanation:
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