astrobiology

astrobiology

astrobiology

Study finds three sigma probability of biological activity outside our solar system

Using data from the James Webb Space Telescope (JWST), a group of astronomers has detected the chemical fingerprints of dimethyl sulfide (DMS) and dimethyl disulfide (DMDS) in the atmosphere of exoplanet K2-18b, which orbits its star in the habitable zone. The detection has been published in The Astrophysical Journal Letters

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Mineral in Martian dust changes explanation for why Mars is red and hints at primitive conditions

The red colour of Mars corresponds to a type of ferrihydrite that is the dominant form of iron oxide in Martian dust, although previous studies have attributed it to anhydrous haematite. The persistence of ferrihydrite, whose formation requires water, suggests that it formed during a cold, wet period, followed by a transition to the planet's current arid environment. The result, based on ESA and NASA space data and new laboratory experiments, is published in Nature Communications.

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Ice detected for the first time near Mars' equator, an area where it was thought to be impossible to exist

ESA's ExoMars and Mars Express missions have for the first time detected ice near the equator of Mars, specifically in the Tharsis volcanoes, an area of the planet where it was thought impossible to exist. According to the researchers, who publish the results in the journal Nature Geoscience, such findings are important for habitability and future human exploration. 

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Reactions: Mars Express examines large ice sheets beneath Mars equator

Fifteen years ago, the European Space Agency's (ESA) Mars Express probe revealed the presence of large deep deposits on Mars, in an area called the Medusae Fossae Formation (MFF), located at its equator. Now, new data from the probe's MARSIS radar indicate that the deposits are deeper than previously thought - up to 3.7 kilometers thick - and include both ice-rich and dusty layers. The results are published in Geophysical Research Letters.

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Reactions to the discovery of an RNA component on the asteroid Ryugu

A Japanese research team has announced in Nature Communications that it found uracil, a component necessary to form RNA, in a small sample collected from the asteroid Ryugu. According to the authors, these results indicate that these molecules of prebiotic interest were commonly formed on asteroids like Ryugu, and reached the early Earth with the impact of these bodies. The sample was collected by the Japan Aerospace Exploration Agency's Hayabusa2 robotic spacecraft, which returned to Earth in December 2020.

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