- April 16, 2024
Re-analysis of data from NASA’s Voyager spacecraft, along with new computer modeling, has led NASA scientists to conclude that four of Uranus’ largest moons likely contain an ocean layer between their cores and icy crusts. Their study is the first to detail the evolution of the interior makeup and structure of all five large moons: Ariel, Umbriel, Titania, Oberon, and Miranda. The work suggests four of the moons hold oceans that could be dozens of miles deep.
In all, at least 27 moons circle Uranus, with the four largest ranging from Ariel, at 720 miles (1,160 kilometers) across, to Titania, which is 980 miles (1,580 kilometers) across. Scientists have long thought that Titania, given its size, would be most likely to retain internal heat, caused by radioactive decay. The other moons had previously been widely considered too small to retain the heat necessary to keep an internal ocean from freezing, especially because heating created by the gravitational pull of Uranus is only a minor source of heat.
The National Academies’ 2023 Planetary Science and Astrobiology Decadal Survey prioritized exploring Uranus. In preparation for such a mission, planetary scientists are focusing on the ice giant to bolster their knowledge about the mysterious Uranus system. Published in the Journal of Geophysical Research, the new work could inform how a future mission might investigate the moons, but the paper also has implications that go beyond Uranus, said lead author Julie Castillo-Rogez of NASA’s Jet Propulsion Laboratory in Southern California.
“When it comes to small bodies – dwarf planets and moons – planetary scientists previously have found evidence of oceans in several unlikely places, including the dwarf planets Ceres and Pluto, and Saturn’s moon Mimas,” she said. “So there are mechanisms at play that we don’t fully understand. This paper investigates what those could be and how they are relevant to the many bodies in the solar system that could be rich in water but have limited internal heat.”
The study revisited findings from NASA’s Voyager 2 flybys of Uranus in the 1980s and from ground-based observations. The authors built computer models infused with additional findings from NASA’s Galileo, Cassini, Dawn, and New Horizons (each of which discovered ocean worlds), including insights into the chemistry and the geology of Saturn’s moon Enceladus, Pluto and its moon Charon, and Ceres – all icy bodies around the same size as the Uranian moons.
What Lies Above and Beneath
The researchers used that modeling to gauge how porous the Uranian moons’ surfaces are, finding that they’re likely insulated enough to retain the internal heat that would be needed to host an ocean. In addition, they found what could be a potential heat source in the moons’ rocky mantles, which release hot liquid, and would help an ocean maintain a warm environment – a scenario that is especially likely for Titania and Oberon, where the oceans may even be warm enough to potentially support habitability.
By investigating the composition of the oceans, scientists can learn about materials that might be found on the moons’ icy surfaces as well, depending on whether substances underneath were pushed up from below by geological activity. There is evidence from telescopes that at least one of the moons, Ariel, has material that flowed onto its surface, perhaps from icy volcanoes, relatively recently.
In fact, Miranda, the innermost and fifth largest moon, also hosts surface features that appear to be of recent origin, suggesting it may have held enough heat to maintain an ocean at some point. The recent thermal modeling found that Miranda is unlikely to have hosted water for long: It loses heat too quickly and is probably frozen now.
But internal heat wouldn’t be the only factor contributing to a moon’s subsurface ocean. A key finding in the study suggests that chlorides, as well as ammonia, are likely abundant in the oceans of the icy giant’s largest moons. Ammonia has been long known to act as antifreeze. In addition, the modeling suggests that salts likely present in the water would be another source of antifreeze, maintaining the bodies’ internal oceans.
Of course, there still are a lot of questions about the large moons of Uranus, Castillo-Rogez said, adding that there is plenty more work to be done: “We need to develop new models for different assumptions on the origin of the moons in order to guide planning for future observations.”
Digging into what lies beneath and on the surfaces of these moons will help scientists and engineers choose the best science instruments to survey them. For instance, determining that ammonia and chlorides may be present means that spectrometers, which detect compounds by their reflected light, would need to use a wavelength range that covers both kinds of compounds.
Likewise, they can use that knowledge to design instruments that can probe the deep interior for liquid. Searching for electrical currents that contribute to a moon’s magnetic field is generally the best way to find a deep ocean, as Galileo mission scientists did at Jupiter’s moon Europa. However, the cold water in the interior oceans of moons such as Ariel and Umbriel could make the oceans less able to carry these electrical currents and would present a new kind of challenge for scientists working to figure out what lies beneath.
Cancel anytime
Web Master
Using our website
You may use the The Middle Land website subject to the Terms and Conditions set out on this page. Visit this page regularly to check the latest Terms and Conditions. Access and use of this site constitutes your acceptance of the Terms and Conditions in-force at the time of use.
Intellectual property
Names, images and logos displayed on this site that identify The Middle Land are the intellectual property of New San Cai Inc. Copying any of this material is not permitted without prior written approval from the owner of the relevant intellectual property rights.
Requests for such approval should be directed to the competition committee.
Please provide details of your intended use of the relevant material and include your contact details including name, address, telephone number, fax number and email.
Linking policy
You do not have to ask permission to link directly to pages hosted on this website. However, we do not permit our pages to be loaded directly into frames on your website. Our pages must load into the user’s entire window.
The Middle Land is not responsible for the contents or reliability of any site to which it is hyperlinked and does not necessarily endorse the views expressed within them. Linking to or from this site should not be taken as endorsement of any kind. We cannot guarantee that these links will work all the time and have no control over the availability of the linked pages.
Submissions
All information, data, text, graphics or any other materials whatsoever uploaded or transmitted by you is your sole responsibility. This means that you are entirely responsible for all content you upload, post, email or otherwise transmit to the The Middle Land website.
Virus protection
We make every effort to check and test material at all stages of production. It is always recommended to run an anti-virus program on all material downloaded from the Internet. We cannot accept any responsibility for any loss, disruption or damage to your data or computer system, which may occur while using material derived from this website.
Disclaimer
The website is provided ‘as is’, without any representation or endorsement made, and without warranty of any kind whether express or implied.
Your use of any information or materials on this website is entirely at your own risk, for which we shall not be liable. It is your responsibility to ensure any products, services or information available through this website meet your specific requirements.
We do not warrant the operation of this site will be uninterrupted or error free, that defects will be corrected, or that this site or the server that makes it available are free of viruses or represent the full functionality, accuracy and reliability of the materials. In no event will we be liable for any loss or damage including, without limitation, loss of profits, indirect or consequential loss or damage, or any loss or damages whatsoever arising from the use, or loss of data, arising out of – or in connection with – the use of this website.
Last Updated: October 1, 2023
New San Cai Inc. (hereinafter “The Middle Land,” “we,” “us,” or “our”) owns and operates www.themiddleland.com, its affiliated websites and applications (our “Sites”), and provides related products, services, newsletters, and other offerings (together with the Sites, our “Services”) to art lovers and visitors around the world.
This Privacy Policy (the “Policy”) is intended to provide you with information on how we collect, use, and share your personal data. We process personal data from visitors of our Sites, users of our Services, readers or bloggers (collectively, “you” or “your”). Personal data is any information about you. This Policy also describes your choices regarding use, access, and correction of your personal information.
If after reading this Policy you have additional questions or would like further information, please contact us.
PERSONAL DATA WE COLLECT AND HOW WE USE IT
We collect and process personal data only for lawful reasons, such as our legitimate business interests, your consent, or to fulfill our legal or contractual obligations.
Information You Provide to Us
Most of the information Join Talents collects is provided by you voluntarily while using our Services. We do not request highly sensitive data, such as health or medical information, racial or ethnic origin, political opinions, religious or philosophical beliefs, trade union membership, etc. and we ask that you refrain from sending us any such information.
Here are the types of personal data that you voluntarily provide to us:
As a registered users or customers, you may ask us to review or retrieve emails sent to your business. We will access these emails to provide these services for you.
We use the personal data you provide to us for the following business purposes:
Information Obtained from Third-Party Sources
We collect and publish biographical and other information about users, which we use to promote the articles and our bloggers who use our sites. If you provide personal information about others, or if others give us your information, we will only use that information for the specific reason for which it was provided.
Information We Collect by Automated Means
Log Files
The site uses your IP address to help diagnose server problems, and to administer our website. We use your IP addresses to analyze trends and gather broad demographic information for aggregate use.
Every time you access our Site, some data is temporarily stored and processed in a log file, such as your IP addresses, the browser types, the operating systems, the recalled page, or the date and time of the recall. This data is only evaluated for statistical purposes, such as to help us diagnose problems with our servers, to administer our sites, or to improve our Services.
Do Not Track
Your browser or device may include “Do Not Track” functionality. Our information collection and disclosure practices, and the choices that we provide to customers, will continue to operate as described in this Privacy Policy, whether or not a “Do Not Track” signal is received.
HOW WE SHARE YOUR INFORMATION
We may share your personal data with third parties only in the ways that are described in this Privacy Policy. We do not sell, rent, or lease your personal data to third parties, and We does not transfer your personal data to third parties for their direct marketing purposes.
We may share your personal data with third parties as follows:
There may be other instances where we share your personal data with third parties based on your consent.
HOW WE STORE AND SECURE YOUR INFORMATION
We retain your information for as long as your account is active or as needed to provide you Services. If you wish to cancel your account or request that we no longer use your personal data, contact us. We will retain and use your personal data as necessary to comply with legal obligations, resolve disputes, and enforce our agreements.
All you and our data are stored in the server in the United States, we do not sales or transfer your personal data to the third party. All information you provide is stored on a secure server, and we generally accepted industry standards to protect the personal data we process both during transmission and once received.
YOUR RIGHTS/OPT OUT
You may correct, update, amend, delete/remove, or deactivate your account and personal data by making the change on your Blog on www.themiddleland.com or by emailing our customer service. We will respond to your request within a reasonable timeframe.
You may choose to stop receiving Join Talents newsletters or marketing emails at any time by following the unsubscribe instructions included in those communications, or you can contact us.
LINKS TO OTHER WEBSITES
The Middle Land include links to other websites whose privacy practices may differ from that of ours. If you submit personal data to any of those sites, your information is governed by their privacy statements. We encourage you to carefully read the Privacy Policy of any website you visit.
NOTE TO PARENTS OR GUARDIANS
Our Services are not intended for use by children, and we do not knowingly or intentionally solicit data from or market to children under the age of 18. We reserve the right to delete the child’s information and the child’s registration on the Sites.
PRIVACY POLICY CHANGES
We may update this Privacy Policy to reflect changes to our personal data processing practices. If any material changes are made, we will notify you on the Sites prior to the change becoming effective. You are encouraged to periodically review this Policy.
HOW TO CONTACT US
If you have any questions about our Privacy Policy, please contact customer service or send us mail at:
The Middle Land/New San Cai
100 Wilshire Blvd., 7th Floor
Santa Monica, CA 90401
USA
Are you sure? Do you want to logout of the account?
The Michelin brothers created the guide, which included information like maps, car mechanics listings, hotels and petrol stations across France to spur demand.
The guide began to award stars to fine dining restaurants in 1926.
At first, they offered just one star, the concept was expanded in 1931 to include one, two and three stars. One star establishments represent a “very good restaurant in its category”. Two honour “excellent cooking, worth a detour” and three reward “exceptional cuisine, worth a
Thank you for your participation,
please Log in or Sign up to Vote
123Sign in to your account
