Vue d'artiste de Kepler-1625b accompagnée de son hypothétique exolune. © Dan Durda

A multitude of potentially habitable moons

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[EN VIDÉO] Direct observation of the formation of an exomoon
The giant Alma radio telescope has taken the first direct image of a moon forming around a very young giant planet.

When we think of astrobiology within our Solar systemwe usually think of March. The Red Planet, near Earth, sheltered in past water in the state liquid on its surface, making it an ideal candidate for the search for extraterrestrial life. But scientists are turning more and more to the study of A moon with a lowercase “L” is the satellite of a planet. For example Phobos and Deimos are the two moons of the planet Mars.
The Moon with a capital “L” is the only natural satellite of the Earth; probably the result of a collision 4.4 years ago…” data-image=” .jpg ” data-url=”” data-more=”Read more”>moons outer solar system: some, likeEurope – moon of Jupiter – or ofEnceladus – moon of Saturn – Suspected of harboring a liquid internal ocean, which could harbor life, prompting the search for extraterrestrial life outside of the living room one’s star system.

Gravitational interactions to heat the interior of the moons?

Understand the mechanisms that intervene to form a liquid ocean inside a body far from its star, we can take the example of Europa, a satellite of Jupiter. Here theEnergy solar energy is too weak to keep liquid water there, yet scientists strongly suspect the presence of a inland ocean. According to the researchers, it would be the gravitational interactions between the Moon and its host planet, Jupiter, that would allow the generation of movements in the interior of Europa, and thus maintain a sufficiently high temperature under the surface of the moon to form a layer of liquid water there: this is what is called heating by effect of tide.

Considering the relatively large number of moons likely to harbor an inner ocean in our Solar System alone, scientists are considering the possibilities of observing similar multi-lunar systems elsewhere in our Solar System. Galaxy they are quite tall, repelling Exobiology sign-seeking is…” data-image=” -fotolia.jpg” data-url=”” data-more=”Read more”>exobiology beyond the habitable zone of a star system. Within your studyscientists point out that within multi-lunar systems, Resonance in physics
This definition derives from the one that physicists give to this term. For them, the phenomenon…” data-image=”” data-url=”https:/ /” data-more=”Read more”>resonances orbital – for example when the Period of revolution of the Earth
In celestial mechanics, we call “revolutionary motion” a periodic circular or elliptical displacement such as…” data-image=” 4 /93429f5b28_79789_periode-revolution.jpg” data-url=”” data-more=”Read more”>orbital period of a moon around its host planet is twice as long as a second – between different moons could increase tidal heating. In some cases, these resonance phenomena could increase the eccentricity of a moon, also increasing the heating effects. In the models used in the study, tidal heating can, in the most extreme theoretical case, heat the interior of a moon by more than 200°C, for a moon orbiting a moon. Exoplanets are very old in astronomy. Its existence is indirectly attested for the first time in…” data-image=” -g – bacon-01.jpg” data-url=”” data-more=”Read More”>exoplanet terrestrial type in two to four days.

Gravitational interactions to stabilize a system?

But the gravitational interactions between two bodies can have other Applications for the habitability of a system. In a better-known case, scientists suggest that the formation of the Moon played a crucial role in the emergence of life on Earth, by stabilizing the tilt axial of our planet, allowing the appearance of a regular seasonal cycle. The heating induced by the interactions between the two bodies also has a role to play in the movements within the core of the Earth divided into two layers.
Liquid in nature, the outer core (density 10) is…” data-image=” jpg” data-url=”” data-more=”Read More”>earth coregenerating the magnetic field that protects us from Its energy is typically 1 GeV (the energy that an electron would have accelerated by a voltage…” data-url=” -cosmic – 2446/” data-more=”Read more”>cosmics raysand that protects our atmosphere des This wind is not very dense (10 particles per cubic centimeter), but it is very fast (400 to 800 km/s). It is a supersonic wind (it moves faster than the waves…” data-url=”” data-more =”Read more” >solar winds. Thus, gravitational interactions between a planet and its moons have effects on the habitability of both the moons and the planet.

These results have important applications in the search for life outside our solar system, now including the search for exomoons, which are very difficult to find. According to the study authors, the effects induced by gravitational interactions between an exoplanet and its possible moons could, on the other hand, be visible, potentially facilitating the detection of exomoons.

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