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Questions tagged [uranus]

Questions regarding Uranus, the 7th planet from Earth's sun.

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How is Uranus' north pole defined?

The rotation axis of the planet Uranus is tilted by 98° compared to its plane of orbit. This means that the north pole of Uranus is "under" the ecliptic compared to the north pole of other planets. ...
usernumber's user avatar
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27 votes
3 answers
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What is the accepted theory as to why Uranus' axis is tilted so severely?

The planet Uranus is another solar system anomaly, where according to the NASA profile has an axial tilt of 97.8 degrees, also considered to be retrograde. This NASA summary "Uranus" suggests the ...
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23 votes
5 answers
8k views

Why is Uranus called a "green planet"?

Uranus is called a green planet, although it appears blue in many of the photographs including those taken by spacecraft, like Voyager 2, Hubble, and JWST. NASA's Uranus page mentions it to be bluish-...
Dhruv Nayak's user avatar
23 votes
4 answers
4k views

Why is Neptune a darker blue than Uranus?

If Neptune and Uranus have similar composition then why is Neptune a darker blue than Uranus?
sno's user avatar
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23 votes
1 answer
6k views

Why do some planets have rings?

Some planets, specifically Jupiter, Saturn, Uranus, and Neptune in our solar system, have planetary rings. Why do some planets have rings? How are they made and from what? Most importantly, will I ...
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22 votes
3 answers
8k views

Why wasn't the planet Uranus recognized by ancient cultures?

Mercury, Venus, Mars, Jupiter, and Saturn have been identified by ancient astronomers as they are visible with naked eye at night. The planet Uranus, despite being visible during very clear nights, ...
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18 votes
2 answers
3k views

Will Neptune be visible with the naked eye if I am standing on its satellite

Assume that I am standing on one of the many satellites of Neptune. Will I be able to see the planet with my naked eyes (without any sort of visual aid). If I was to stand on Moon I would be able to ...
Rahul Kadukar's user avatar
13 votes
4 answers
4k views

Could Neptune be viewed with the naked eye from Uranus?

Which star or planet in our night sky can match what Neptune would look like when viewed from Uranus, or one of its moons? The answer would be for the most favourable condition, which is when Neptune ...
Constantthin's user avatar
13 votes
1 answer
2k views

How is it possible for a collision to be responsible for Uranus's axial tilt?

I realize that the collision explanation is in any case highly (purely?) speculative, but I'm curious how it would work. If Uranus is a ball of gas, why wouldn't any colliding object just pass ...
Kurt Weber's user avatar
13 votes
2 answers
403 views

If the axial tilt of Uranus (97°) was caused by a giant impact, then why do its moons orbit around its equator at the same tilt (≈97°)?

So the most accepted explanation for Uranus' axial tilt is that it once had a normal tilt like the other planets bar Venus (0° to 30°), but then a certain massive object collided with it and flipped ...
user177107's user avatar
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10 votes
3 answers
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Are spacecraft visits to Uranus and Neptune hard to plan?

Until today, Voyager 2 remains the only spacecraft to visit these planets. Are spacecraft visits to these planets hard to plan or develop?
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10 votes
1 answer
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Why do Uranus and Neptune have more methane than Jupiter and Saturn?

So the standard theory of the solar nebula is that in the region of the gas planets, ice and rock could condense to form planetesimals, which could then accrete hydrogen and helium to form the gas ...
cduston's user avatar
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9 votes
1 answer
896 views

Which star did Uranus occult in 1977 when the planet's rings were discovered?

In 1977, Uranus occulted a star, and the starlight flickered 40 minutes before and after the actual occultation, revealing Uranus' rings.This is common knowledge to astronomers, but what I can't find ...
George A. Solodun's user avatar
9 votes
1 answer
320 views

What are the current accepted theories of the formation of the Uranian moon Miranda?

Miranda, a moon of Uranus is unique in that it has a very fractured surface Source: University of Oregon The surface is said to be jagged and fractured, with comparatively large disjointed cliffs ...
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8 votes
1 answer
1k views

How am I supposed to locate the planets Uranus and Neptune with a 70 mm f/5.7 refractor?

I can locate all of the planets other than Uranus and Neptune. This is mainly because they are very dim and I live where there is just enough light pollution so that I can't spot them. I have a Gysker ...
Oscar's user avatar
  • 99
8 votes
1 answer
376 views

Why is Uranus able to support a regular satellite system?

Uranus has an obliquity of 98° which means that the mutual inclination between a satellite orbiting in its equatorial plane and the orbit of Uranus around the Sun would exceed the critical angle for ...
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8 votes
2 answers
268 views

Could there be liquid water on Uranus? Are there any indications that there might be?

Like most planets, Uranus has a very cold outer atmosphere and a very hot core. What we see is a very thick primary atmosphere with plenty of hydrogen. Deeper in, we might suppose that water ...
Mike Serfas's user avatar
7 votes
1 answer
709 views

Why was Neptune rather than Uranus chosen as an archetype?

The largest exoplanets are typically called Jupiter-like planets, or hot/cold Jupiters. Since Jupiter is the largest most massive planet in our Solar system, it makes sense that it would be chosen as ...
usernumber's user avatar
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7 votes
1 answer
2k views

Is Uranus the farthest object in Solar System that you can see with naked eyes?

The following text is from this article: The fact is, even at its brightest, Uranus is still quite faint. It’s barely perceptible as a dim speck of light to the unaided eye, even under dark skies. At ...
Nilay Ghosh's user avatar
  • 4,701
7 votes
1 answer
212 views

What is the underlying nature of the dark spot found on Uranus?

What is the nature of bright spots found on Uranus? actually quotes Space.com's Uranus Has a Dark Spot which says: During the past decade, many bright spots have been seen on Uranus in both red and ...
uhoh's user avatar
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7 votes
1 answer
184 views

What is the nature of bright spots found on Uranus?

The following text is from space.com which was written during the time of discovery of the first dark spot on Uranus: During the past decade, many bright spots have been seen on Uranus in both red ...
Nilay Ghosh's user avatar
  • 4,701
6 votes
1 answer
1k views

Why is the magnetic axis of Uranus and Neptune off center?

It(Uranus) rotates on its side, tilted almost 98 degrees from the plane of its orbit around the sun. The axis of its magnetic field is tilted too, at a 59-degree angle from the rotational axis. The ...
Nilay Ghosh's user avatar
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6 votes
2 answers
6k views

Why are gas giants colored the way they are?

As I understand it, Jupiter, Saturn, Uranus, and Neptune are all made primarily from varying proportions of hydrogen and helium. Despite this, Jupiter is very red, Saturn is yellow, and Uranus and ...
NeutronStar's user avatar
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6 votes
0 answers
170 views

Are there any planetary ring system other than "Phoebe ring" not aligned to the equatorial plane?

Continuation of: Is it possible for planetary rings to be perpendicular (or near perpendicular) to the planet's orbit around the host star? The answers discussed about Uranian ring system and how ...
Nilay Ghosh's user avatar
  • 4,701
5 votes
1 answer
356 views

Aren't there any rock or similar firm material on/in the gas giant planets?

Aren't there any rock or similar firm material on/in the gas giant planets? What happens if a rock asteroid hits one of these planets? Shouldn't the rock accumulate in the center of the planet due to ...
d-b's user avatar
  • 349
5 votes
1 answer
415 views

Before Voyager 2, what were the highest quality photos of Uranus and Neptune?

I'm in search of historical knowledge of the outer ice giants, which seems so hard to come by. Right now I would be happy with just a photo of each, the best photo we had of them before Voyager 2. ...
DrZ214's user avatar
  • 1,970
4 votes
2 answers
721 views

Why are heavier hydrocarbons not present in lower part of Uranian atmosphere?

I recently answered this question. While researching for the answer, I found one point quite counter-intuitive. The heavier hydrocarbons resides in stratosphere while methane, the lightest hydrocarbon ...
Nilay Ghosh's user avatar
  • 4,701
4 votes
1 answer
633 views

Calculating net gravitational force on Uranus

I want to calculate the net/total gravitational force which is being exerted on the planet Uranus. There are many objects in our solar system like the Sun, other planets, moons of other planets, moons ...
apk's user avatar
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4 votes
1 answer
559 views

Uranus' axis of rotation-when discovered?

Who discovered it, and how was that accomplished. I had assumed it was known before Voyager 2 arrived at the planet since it isn't mentioned in JPL voyager 2 Uranus Approach
Bob516's user avatar
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4 votes
1 answer
404 views

What causes the strong winds on Uranus?

I was just looking up something about Uranus on Google, and read a line I had read many times before - "The strong winds of Uranus...". So, short and easy - "What causes the strong ...
Infinity Milestone's user avatar
4 votes
1 answer
66 views

What is the difference between aurorae and electroglow?

One of the discoveries of Voyager 2 at Uranus was a phenomenon called "electroglow", which as I understand it is related to charged particles interacting with the atmosphere that cause the ...
user avatar
4 votes
1 answer
186 views

What constraints are there on solid material in the ice giants?

Recently there has been experimental verification of superionic water ice (suggested to be called ice XVIII, not sure if this nomenclature is official yet), which turns out to be a solid (or at ...
user avatar
4 votes
1 answer
194 views

Composition of ice giants

After reading the paper "The Measured Compositions of Uranus and Neptune from their Formation on the CO Ice Line", I was left with doubts which I would like to clarify. Firstly, the paper proposes ...
URIZEN's user avatar
  • 387
3 votes
2 answers
653 views

Does the lower mass of Uranus suggest it swapped position with Neptune?

As Uranus is less massive than Neptune, would this be evidence that it was formed further away from the sun than Neptune, and later it swaps orbit with Neptune to move closer to sun?
Gstestso's user avatar
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3 votes
2 answers
127 views

When (yyyy-mm-dd) does the north pole of uranus most nearly point towards the sun?

When (yyyy-mm-dd) does the north pole of uranus most nearly point towards the sun? The information I've found suggests this happened in 1944 or 1945, but would like to find a more precise date or ...
TimAK's user avatar
  • 31
3 votes
1 answer
2k views

Would a spacecraft just go "through" a gas giant?

From my understanding of the word gas giant, it is a planet composed of entirely a gaseous atmosphere, and so planets Jupiter and onwards fall in this category. That being said, what would stop a ...
K Split X's user avatar
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3 votes
1 answer
114 views

What kind of effects can maintain Uranus' rings' eccentricities?

The recent paper Thermal Emission from the Uranian Ring System has been in the news recently. The introduction mentions: The ε ring, the brightest and most massive of the narrow rings, was shown to ...
uhoh's user avatar
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3 votes
0 answers
100 views

Discovery papers for Uranus and Neptune

I would like to have the discovery papers, notices or announcements done by Herschel with Uranus and Le Verrier with Neptune. I know that Herschel adressed the Royal Society and Le Verrier sent some ...
Swike's user avatar
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2 votes
1 answer
398 views

axial tilt of uranus [duplicate]

Simple question: I read that the axial tilt of Uranus is 97.77 degrees. I don't understand why it would be this instead of 82.23 degrees the other way. It seems like saying that the Earth's axial tilt ...
stanley dodds's user avatar
2 votes
2 answers
127 views

First spectroscopic detection of Uranus' rotation?

As an undergraduate exercise quite a while ago, we placed the equator of Jupiter's disk across the slit of a high resolution grating spectrometer and then measured the tilt of the resulting line in ...
uhoh's user avatar
  • 31.1k
2 votes
1 answer
69 views

Qualities of gas giant atmospheres at a density of 1 gram per cubic centimeter

At what depth in the atmospheres of the gas giants does the density of their atmospheres equal 1 gram per cubic centimeter? What is the pressure and temperature at these depths? Are the radiations ...
user141802's user avatar
1 vote
2 answers
2k views

Does Uranus have a stronger gravitational pull on its moons than Earth does?

I've read that Uranus has a lower surface gravity due to its lower density than Earth. However, does this mean Uranus has a weaker pull on its moons than Earth does for the same reason?
StellarExile's user avatar
1 vote
1 answer
709 views

Why are Uranus' satellites named after characters in Shakespeare?

Oberon, Titania, Ophelia, Puck, Miranda... Uranus' satellites are named for characters in the works of Shakespeare and Pope. Yet the names of Jupiter and Saturn's moon come from the Roman and Greek ...
usernumber's user avatar
  • 17.6k
1 vote
2 answers
544 views

Transit of Uranus from Neptune

I would like to help find sources or calculations for the following dates found in Wikipedia (in French). The next Uranus transit from Neptune will happen : ...
A BOUZINAC's user avatar
1 vote
0 answers
195 views

Which are the consequences of Uranus' high rotation axis angle? [closed]

The rotation axis of Uranus is 90 degrees away from vertical, there are some theories about its reason.. But which are the consequences of this? Which are the unique features of Uranus that happened ...
Zoltán Schmidt's user avatar
0 votes
1 answer
255 views

Why was Uranus named what it was? [duplicate]

Why was Uranus named what it was, and who came up with the name?
Picachieu's user avatar
  • 216
0 votes
1 answer
180 views

Will the planets be pushed outwards when the sun goes red giant?

When the sun goes red giant will the planets be pushed outwards towards the periphery of the solar system? If so, will this happen simultaneously to all planets or could, for example, a planet like ...
Constantthin's user avatar
0 votes
0 answers
59 views

Has Hubble ever imaged Titania?

I can't find any non-voyager images of Uranus' largest moon - Titania. Did Hubble produce any? Titania is about 1.5 times smaller, but is about 1.5 times closer than Pluto - and we did have blurry ...
Noone AtAll's user avatar
-2 votes
1 answer
402 views

What is Saturn’s apparent magnitude at its brightest when viewed from Uranus?

Considering that the apparent magnitude scale is an inverted scale; what is the lowest apparent magnitude of Saturn that can be seen from Uranus. We are of course talking about when Saturn is viewed ...
Constantthin's user avatar
-4 votes
2 answers
207 views

What is Jupiter's apparent magnitude as watched from Uranus?

Saturn's apparent magnitude from Uranus is +3.228. Jupiter orbits closer to the sun than Saturn. Can we therefore expect Jupiter’s apparent magnitude from Uranus to be dimmer than Saturn's, or is it ...
Constantthin's user avatar