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Home NEWS Science News Chemistry

SwRI researcher theorizes worlds with underground oceans support, conceal life

Bioengineer by Bioengineer
March 16, 2021
in Chemistry
Reading Time: 3 mins read
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Layers of ice and rock obviate the need for “habitable zone” and shield life against threats

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Credit: NASA/JPL-Caltech/Southwest Research Institute

SAN ANTONIO — March 16, 2021 — One of the most profound discoveries in planetary science over the past 25 years is that worlds with oceans beneath layers of rock and ice are common in our solar system. Such worlds include the icy satellites of the giant planets, like Europa, Titan and Enceladus, and distant planets like Pluto.

In a report presented at the 52nd annual Lunar and Planetary Science Conference (LPSC 52) this week, Southwest Research Institute planetary scientist S. Alan Stern writes that the prevalence of interior water ocean worlds (IWOWs) in our solar system suggests they may be prevalent in other star systems as well, vastly expanding the conditions for planetary habitability and biological survival over time.

It has been known for many years that worlds like Earth, with oceans that lie on their surface, must reside within a narrow range of distances from their stars to maintain the temperatures that preserve those oceans. However, IWOWs are found over a much wider range of distances from their stars. This greatly expands the number of habitable worlds likely to exist across the galaxy.

Worlds like Earth, with oceans on their exterior, are also subject to many kinds of threats to life, ranging from asteroid and comet impacts, to stellar flares with dangerous radiation, to nearby supernova explosions and more. Stern’s paper points out that IWOWs are impervious to such threats because their oceans are protected by a roof of ice and rock, typically several to many tens of kilometers thick, that overlie their oceans.

“Interior water ocean worlds are better suited to provide many kinds of environmental stability, and are less likely to suffer threats to life from their own atmosphere, their star, their solar system, and the galaxy, than are worlds like Earth, which have their oceans on the outside,” said Stern.

He also points out that the same layer of rock and ice that protects the oceans on IWOWs also conceals life from being detected by virtually all astronomical techniques. If such worlds are the predominant abodes of life in the galaxy and if intelligent life arises in them — both big “ifs,” Stern emphasizes — then IWOWs may also help crack the so-called Fermi Paradox. Posed by Nobel Laureate Enrico Fermi in the early 1960s, the Fermi Paradox questions why we don’t see obvious evidence of life if it’s prevalent across the universe.

“The same protective layer of ice and rock that creates stable environments for life also sequesters that life from easy detection,” said Stern.

###

In 2015, NASA created the Ocean Worlds Exploration Program, which seeks to explore an ocean world to determine habitability and seek life. Moons that harbor oceans under a shell of ice, such as Europa and Titan, are already the targets of NASA missions to study the habitability of these worlds.

The paper, “Some Implications for Both Life and Civilizations Regarding Interior Water Ocean Worlds” at LPSC 52 is available at https://www.hou.usra.edu/meetings/lpsc2021/pdf/1180.pdf.

To learn more about ocean worlds, watch https://youtu.be/_9AYw2EQm8s and https://youtu.be/086N-X1Bd2o.

For more information, visit https://www.swri.org/planetary-science.

Media Contact
Maria Stothoff
[email protected]

Original Source

https://www.swri.org/press-release/swri-researcher-theorizes-worlds-underground-oceans ?utm_source=EurekAlert!&utm_medium=Distribution&utm_campaign=Fermi_Peridox-PR

Tags: AstronomyAstrophysicsPlanets/MoonsSpace/Planetary ScienceStars/The Sun
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