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The study shows that some exoplanets can have a greater variety of lives than there are on Earth



  A study shows that some exoplanets can have a greater variety of lives than there are on Earth.
The artist's concept shows what the planetary system TRAPPIST-1 might look like, based on available data on the diameters, masses, and distances of host star planets, as of February 2018. 3 of the 7 exoplanets are in the "habitable zone" in which liquid water is possible. See https://exoplanets.nasa.gov/trappist1/ Credits: NASA / JPL-Caltech

A new study shows that some exoplanets have better living conditions than Earth. "This is a surprising conclusion," said lead researcher. Stephanie Olson. "It shows us that the conditions on some exoplanets with favorable ocean circulation patterns are better suited to support a life that is more frequent or more active than life on Earth."

The discovery of exoplanets hastened the search for life outside of our solar system. Due to the large distances to these exoplanets, they are virtually impossible to reach with space probes. Therefore, scientists work with remote sensing tools such as telescopes to understand what conditions prevail on various exoplanets. In order to understand these remote observations, sophisticated models of the planet's climate and evolution must be developed so that scientists can see on which of those distant planets life could take place.

A new synthesis of this work will be presented in a keynote address at the Goldschmidt Institute of Geochemistry. Stephanie Olson (University of Chicago) Finding Exoplanets Best Living Environments:

"NASA is looking for life in the universe, focusing on so-called" habitable zones. "Planets are worlds that have the potential for oceans with liquid water. But not all oceans are equally hospitable – and some oceans will provide better living conditions than others due to their global circulation patterns. "

Olson's team modeled probable conditions for various species of oceans exoplanets using the ROCKE-3-D software developed by Goddard NASA's Institute for Space Studies (GISS) was developed to simulate the climate and habitats of the oceans species of exoplanets.

"Our work aims to identify the exoplanetic oceans that have the greatest capacity to lead a rich and active life worldwide." Life in Earth's oceans depends on the upwelling that feeds nutrients out of the world the dark depths of the ocean can be traced back to the sunlit parts of the ocean where photosynthetic life lives in. More uplift means more nutrient delivery, which means more biological activity, these are the conditions we need to look for in exoplanets. "

They modeled a variety of possible exoplanets and were able to define which types of exoplanets have the best chance of developing and sustaining thriving biospheres.

"We have used a model of ocean circulation to identify which planets are the most efficient and thus provide particularly hospitable oceans, and we found that higher atmospheric density, slower rotation rates, and the presence of continents yield higher upward rates. Another implication is that the earth may not be optimally habitable – and that life on another planet is even more hospitable than our own.

Our technology will always have limitations, so life is almost certainly more common than " verifiable "" life. This means that in our search for life in the universe, we should target the subset of habitable planets most favorable to large, globally active biospheres, as these are the planets on which life is easiest to discover – and on where there are no discoveries will be the most meaningful. "

Dr. Olson notes that we do not yet have telescopes that can identify and validate suitable exoplanets The proposed LUVOIR or HabEx telescope concepts have the right functions and now we know what to look for . "

Professor Chris Reinhard (Georgia Institute of Technology) said:

" We expect the oceans to be important in order to remotely control some of the most convincing habitats, but our understanding of the oceans beyond is recognizable on habitable worlds The work of Dr. Olson is a significant and exciting advance in our understanding of exoplanetic oceanography. "

The first exoplanet was discovered in 1992, and more than 4000 exoplanets have been confirmed. The next known exoplanet is Proxima Centauri b Currently, much of the search for life on exoplanets focuses on those in the habitable zone, ie the distance from a star, where the temperature of a planet allows liquid water oceans for life on the earth are of vital importance.


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Further information:
goldschmidt.info/2019/

Provided by
Goldschmidt Conference

Quote :
Study shows that some exoplanets may have more diversity in life than on Earth (2019, 22 August)
retrieved on August 22, 2019
from https://phys.org/news/2019-08-exoplanets-greater-variety-life-earth.html

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