whats on uranus??

Question

lol

Answer 1

Uranus' mass is roughly 14.5 times that of the Earth, making it the least massive of the giant planets, while its density of 1.29g/cm³ makes it the second least dense planet after Saturn.[7] Though of a similar diameter to Neptune (roughly four times Earth's), it is less massive.[4] These values indicate that it is made primarily of various ices, such as water, ammonia, and methane.[9] The total mass of ice in Uranus' interior is not precisely known, as different figures emerge depending on the model chosen; however, it must be between 9.3 and 13.5 Earth masses.[9][55] Hydrogen and helium constitute only a small part of the total, with between 0.5 and 1.5 Earth masses.[9] The remainder of the mass (0.5 to 3.7 Earth masses) is accounted for by rocky material

The standard model of Uranus' structure is that it consists of three layers: a rocky core in the center, an icy mantle in the middle and an outer gaseous hydrogen/helium envelope. The core is relatively small, with a mass of only 0.55 Earth masses and a radius less than 20 percent Uranus'; the mantle comprises the bulk of the planet, with around 13.4 Earth masses, while the upper atmosphere is relatively insubstantial, weighing about 0.5 Earth masses and extending for the last 20 percent of Uranus' radius.Uranus' core density is around 9 g/cm³, with a pressure at the core/mantle boundary of 8 million bar and a temperature of about 5000 K. The ice mantle is not in fact composed of ice in the conventional sense, but of a hot and dense fluid consisting of water, ammonia and other volatiles. This fluid, which has a high electrical conductivity, is sometimes called water–ammonia ocean. The bulk compositions of Uranus and Neptune are very different from those of Jupiter and Saturn, with ice dominating over gases, hence justifying their separate classification, ice giants.

While the model considered above is more or less standard, it is not unique; other models also satisfy observations. For instance, if substantial amounts of hydrogen and rocky material are mixed in the ice mantle, the total mass of ices in the interior will be lower, and, correspondingly, the total mass of rocks and hydrogen will be higher. Presently available data does not allow us to determine which model is correct. The fluid interior structure of Uranus means that it has no solid surface. The gaseous atmosphere gradually transitions into the internal liquid layers.However for the sake of convenience an oblate spheroid of revolution, where pressure equals 1 bar, is designated conditionally as a ‘surface’. It has equatorial and polar radii of 25,559 ± 4 and 24,973 ± 20 km, respectively.This surface will be used throughout this article as a zero point for altitudes.


Internal heat
Uranus' internal heat appears markedly lower than that of the other giant planets; in astronomical terms, it has a low thermal flux. Why Uranus' internal temperature is so low is still not understood. Neptune, which is Uranus' near twin in size and composition, radiates 2.61 times as much energy into space as it receives from the Sun. Uranus, by contrast, radiates hardly any excess heat at all. The total power radiated by Uranus in the far infrared (i.e. heat) part of the spectrum is 1.06 ± 0.08 times the solar energy absorbed in its atmosphere. In fact, Uranus' heat flux is only 0.042 ± 0.047 W/m², which is lower than the internal heat flux of Earth of about 0.075 W/m². The lowest temperature recorded in Uranus' tropopause is 49 K, making Uranus the coldest planet in the Solar System, colder than Neptune.

Hypotheses for this discrepancy include that when Uranus was "knocked over" by the supermassive impactor which caused its extreme axial tilt, the event also caused it to expel most of its primordial heat, leaving it with a depleted core temperature. Another hypothesis is that some form of barrier exists in Uranus' upper layers which prevents the core's heat from reaching the surface. For example, convection may take place in a set of compositionally different layers, which may inhibit the upward heat transport.

Answer 2

There is no well-defined solid surface to Uranus.

Scientists use "1 bar" or the air pressure at sea level on Earth as the dividing point for identifying the 3 layers in Uranus' atmosphere:
- the troposphere, between altitudes of −300 and 50 km and pressures from 100 to 0.1 bar
- the stratosphere, spanning altitudes between 50 and 4000 km and pressures of between 0.1 and 10^-10 bar
- the thermosphere/corona extending from 4,000 km to as high as 50,000 km from the surface

The atmosphere is 83% hydrogen, 15% helium, and 2% methane.

Uranus' mass is about 14.5 times that of the Earth, but is the second least-dense planet after Saturn.
It is a similar diameter as Neptune but less massive. This indicates that it is made primarily of various ices, such as water, ammonia, and methane. The total mass of ice in Uranus' interior is not precisely known, but it is estimated to be between 9.3 and 13.5 Earth masses. Hydrogen and helium are only a small part - between 0.5 and 1.5 Earth masses. The remainder of the mass (0.5 to 3.7 Earth masses) is accounted for by rocky material.

Answer 3

Jupiter/Saturn/Uranus/Neptune are known as Gas Giants.

Answer 4

Hi. Gas.

Answer 5

A hemorrhoid. It hurts too. :(

Answer 6

Hair...and a lot of it!

XD

Answer 7

nuttin'... how's about yers?... dingleberries?....