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Science

They detect salt water lakes under the south pole of the planet Mars

London / Under the south pole of the planet Mars there are lakes of liquid salty water of various sizes, as described by an international team of scientists in the journal “Nature Astronomy”.

The researchers believe that the humid areas that they have detected in that Martian region are due to masses that remain in a liquid state, despite the low temperatures, thanks to a high concentration of perchlorate salts.

Previously, one of these regions under the surface of the red planet had already been identified based on data from one of the instruments on board the European Mars Express spacecraft, although the debate on its nature and composition had not yet been closed.

Roberto Orosei’s group, from the Roma III University, together with researchers from Australia and Germany, have now used the techniques used by the terrestrial satellites that track Antarctica in order to re-analyze the original data from the Mars radar Express, known as MARSIS.

The device began collecting information on the planet in 2005, after being launched with the spacecraft in 2003.

After several years of acquiring data, the lack of clear evidence of liquid water under the Martian ice caps led scientists to think that, if it existed, the liquid would be deeper than they had thought.

In 2018, however, a reinterpretation of those explorations revealed a 20-kilometer-wide lake in the region known as Ultimi Scopuli.

The work published this Monday, in which several of the authors of that original study participate, tries to shed new light on that discovery and expand its analysis.

Results

To do this, they have explored a region of 200 by 350 square kilometers around the location where the first lake was detected.

Their results “corroborate the initial discovery” of “a stable mass of liquid water in Ultimi Scopuli” using “a different technique than the independent one”, describes the text published in “Nature Astronomy”.

At the same time, his work has uncovered “a more extensive and complex scenario, with ubiquitous patches of water around the subglacial lake.”

The physical, geological, climatic and topographic conditions that allow the existence of these liquid masses are still a matter of debate, the scientists emphasize.

At the same time, they stand out that hypersaline aqueous solutions have been found on Earth in subglacial areas at temperatures “much lower than the freezing point of water”.

Given this evidence, they propose that the most plausible form of liquid water under the Martian ice cap is perchlorate brine, an aqueous solution with more than 5% salt concentration. (September 29, 2020, EFE / PracticaEspañol)

(Automatic translation)

News related in video (July 2018):


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Question 1
En general, el texto habla de...
A
cuándo fue descubierto el primer lago del planeta Marte.
B
un satélite que fue lanzado en 2003 para recopilar información sobre Marte.
C
unos lagos de agua líquida que han sido hallados en Marte.
Question 2
En el texto se dice que...
A
los científicos desmienten que haya agua en Marte.
B
el agua de todos esos lagos que han sido detectados está completamente congelada.
C
esos lagos que han sido detectados se hallan bajo el polo sur del planeta rojo.
Question 3
Según el texto...
A
hasta ahora no se había descubierto ningún lago en Marte.
B
se ha descartado que haya una relación entre la existencia de zonas húmedas con una alta concentración de sales de perclorato.
C
hace unos años los científicos pensaron que si hay agua en estado líquido, esta estaría a mayor profundidad de lo que pensaban.
Question 4
Leyendo el texto entendemos que...
A
acaba de lanzarse al espacio un satélite para que recopile más información sobre Marte.
B
ya no hay ningún tipo de debate relacionado con la superficie del planeta Marte.
C
se confirma que hay agua en estado líquido en Ultimi Scopuli.
Question 5
En el vídeo se dice que...
A
los científicos creen que ese lago podría ser un depósito biológico.
B
ese lago no está por debajo de la superficie de Marte.
C
ese lago no se parece en nada a los grandes lagos de agua líquida hallados en la Antártida.
Question 6
La expresión "a fin de" significa...
A
"de este modo".
B
"en resumen".
C
"para".
Question 7
Se llama "planeta rojo"...
A
al planeta Marte.
B
al Sol.
C
al planeta Júpiter.
Question 8
El término "marciana" hace referencia...
A
al planeta Marte.
B
al mar.
C
a algo que es extraño.
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