{"id":5366,"date":"2024-10-28T13:10:23","date_gmt":"2024-10-28T18:10:23","guid":{"rendered":"https:\/\/blogs.und.edu\/press-releases\/?p=5366"},"modified":"2024-10-30T09:58:35","modified_gmt":"2024-10-30T14:58:35","slug":"uranus-moon-miranda-may-have-an-ocean-beneath-its-surface-new-study-finds","status":"publish","type":"post","link":"https:\/\/blogs.und.edu\/press-releases\/2024\/10\/uranus-moon-miranda-may-have-an-ocean-beneath-its-surface-new-study-finds\/","title":{"rendered":"Uranus\u2019 Moon Miranda May Have an Ocean Beneath Its Surface, New Study Finds"},"content":{"rendered":"

UND scholars team up with researchers at the Johns Hopkins Applied Physics Laboratory to uncover the mysteries of Miranda<\/strong><\/p>\n

\"montage<\/a>
Uranus and its five major moons are depicted in this montage of images acquired by the Voyager 2 spacecraft. Miranda is the second largest moon in the photo. Credit: NASA\/JPL, Public domain, via Wikimedia Commons.<\/figcaption><\/figure>\n

A new study suggests Uranus\u2019 moon, Miranda, may harbor a water ocean beneath its surface, a finding that would challenge many assumptions about the moon\u2019s history and composition and could put it in the company of the few select worlds in our solar system with potentially life-sustaining environments.<\/p>\n

\u201cTo find evidence of an ocean inside a small object like Miranda is incredibly surprising,\u201d said Tom Nordheim, a planetary scientist at the Johns Hopkins Applied Physics Laboratory, a study co-author and the principal investigator on the project that funded the study. \u201cIt helps build on the story that some of these moons at Uranus may be really interesting \u2014 that there may be several ocean worlds around one of the most distant planets in our solar system, which is both exciting and bizarre.\u201d<\/p>\n

Also involved in the research project and co-author of the The Planetary Science Journal<\/em><\/strong><\/a> article, is Sherry Fieber-Beyer,<\/strong><\/a> associate professor of\u00a0Space Studies,<\/strong><\/a> who said the project is significant because it helps planetary scientists better frame the context of the solar system\u2019s formation and evolution.<\/p>\n

\u201cEvolutionary models of the solar system invoke giant planet migrations scattering objects from the inner solar system to the outer system\u2014and vice versa,\u201d said Fieber-Beyer. \u201cThese migrations resulted in the creation of Jupiter\u2019s asteroids, irregular satellites, and other astronomical phenomena. We must consider whether these moons formed at their location or whether they were captured during planetary migration.\u201d<\/p>\n

Among the moons in the solar system, Miranda stands out. The few images Voyager 2 captured in 1986 show Miranda\u2019s southern hemisphere (the only part we\u2019ve seen) is a Frankenstein-like hodgepodge of grooved terrain quartered off by rough scarps and cratered areas, like squares on a quilt. Most researchers suspect these bizarre structures are the result of tidal forces and heating within the moon.<\/p>\n

Caleb Strom, a graduate student at UND who worked with Nordheim and Alex Patthoff of the Planetary Science Institute in Arizona, revisited the Voyager 2 images. The team set out to explain Miranda\u2019s enigmatic geology by reverse engineering the surface features, working backward to uncover what the moon\u2019s interior structure must have been to shape the moon\u2019s geology in response to tidal forcing.<\/p>\n

\u201cThis research helps us understand what the requirements are for an icy moon to be an ocean world, which is relevant to assessing the habitability of icy outer solar system satellites,\u201d Strom said. \u201cWe do not know enough about the Uranian satellites to say whether there could be life on them, but understanding what factors would result in them having subsurface oceans is an important step toward addressing that question.\u201d<\/p>\n

After first mapping the various surface features such as cracks, ridges and Miranda\u2019s unique trapezoidal coronae, the team developed a computer model to test several possible structures of the moon\u2019s interior, matching the predicted stress patterns to the actual surface geology.<\/p>\n

The setup that produced the best match between predicted stress patterns and observed surface features required that Miranda had a vast ocean beneath its icy surface some 100 to 500 million years ago. This subsurface ocean was at least 62 miles (100 kilometers) deep, according to the study published Oct. 16 in the Planetary Science Journal, and hidden beneath an icy crust no more than 19 miles (30 kilometers) thick. Given Miranda has a radius of just 146 miles (235 kilometers), the ocean would have filled almost half of the moon\u2019s body. \u201cThat result was a big surprise to the team,\u201d Strom said.<\/p>\n

Key to creating that ocean, the researchers believe, were tidal forces between Miranda and nearby moons. These regular gravitational tugs can be amplified by orbital resonances \u2014 a configuration where each moon\u2019s period around a planet is an exact integer of the others\u2019 periods. Jupiter\u2019s moons Io and Europa, for example, have a 2:1 resonance: For every two orbits Io makes around Jupiter, Europa makes exactly one, leading to tidal forces that are known to sustain an ocean beneath Europa\u2019s surface.<\/p>\n

These orbital configurations and the resulting tidal forces deform the moons like rubber balls, leading to friction and heat that keeps interiors warm. This also creates stresses that crack the surface, creating a rich tapestry of geologic features. Numerical simulations have suggested that Miranda and its neighboring moons likely had such a resonance in the past, offering a potential mechanism that could have warmed Miranda\u2019s interior to produce and maintain a subsurface ocean.<\/p>\n

At some point, the moons\u2019 orbital ballet desynchronized, slowing the heating process so that the moon\u2019s insides started to cool and solidify. But the team doesn\u2019t think Miranda\u2019s interior has fully frozen yet. If the ocean had completely frozen, Nordheim explained, it would have expanded and caused certain telltale cracks on the surface, which aren\u2019t there. This suggests that Miranda is still cooling \u2014 and may have an ocean beneath its surface even now. Miranda\u2019s modern-day ocean is probably relatively thin, Strom noted.<\/p>\n

\u201cBut the suggestion of an ocean inside one of the most distant moons in the solar system is remarkable,\u201d he said.<\/p>\n

Miranda wasn\u2019t predicted to have an ocean. With its small size and old age, scientists thought it would likely be a frozen ball of ice. Any leftover heat from its formation was assumed to have dissipated long ago. But as Patthoff pointed out, predictions about ice moons can be wrong, as evidenced by Saturn\u2019s moon Enceladus. Before the Cassini spacecraft arrived in 2004, many scientists thought Enceladus was a frozen ball of ice and rock. But it was actually harboring a global ocean and active geological processes.<\/p>\n

\u201cFew scientists expected Enceladus to be geologically active,\u201d Patthoff said. \u201cHowever, it\u2019s shooting water vapor and ice out of its southern hemisphere as we speak.\u201d<\/p>\n

Enceladus is now a prime target in the search for life beyond Earth.<\/p>\n

Miranda might be a similar case. It\u2019s comparable in size and composition to Enceladus, and according to a 2023 study,<\/a>\u00a0<\/strong>it may be actively releasing material into space. If it has (or even had) an ocean, it could be a future target for studying habitability and life. However, Nordheim cautions that there\u2019s still too much we don\u2019t know about Miranda and the Uranian moons to speculate about the existence of life.<\/p>\n

\u201cWe won\u2019t know for sure that it even has an ocean until we go back and collect more data,\u201d he said. \u201cWe\u2019re squeezing the last bit of science we can from Voyager 2\u2019s images. For now, we\u2019re excited by the possibilities and eager to return to study Uranus and its potential ocean moons in depth.\u201d<\/p>\n

At approximately 1.692 billion miles from Earth, Miranda is situated about 80,654 miles from the center of Uranus, orbiting the planet approximately once every 1.4 earth days, according to NASA.<\/p>\n

*****<\/p>\n","protected":false},"excerpt":{"rendered":"

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