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Analysant le spectre de réflexion d’un des astéroïdes qui tournent autour de la Planète rouge, des astrophysiciens ont découvert que le composé chimique de ce corps céleste est presqu’identique à celui de la Lune. Ils n’excluent pas qu’il s’agisse d’un fragment de notre satellite qui s’en serait séparé à une époque lointaine.

Un des astéroïdes circulant dans le champ gravitationnel de Mars a étonné les scientifiques par sa ressemblance avec la Lune du point de vue de sa composition chimique, ce qui soulève nécessairement plusieurs questions sur son origine, écrit Science Alerte.

Il s’agit de l’astéroïde 101429 (1998 VF) qui fait partie d’un groupe d’astéroïdes troyens de Mars qui se trouve aux alentours de deux points de Lagrange du système Soleil-Mars.Utilisant le spectrographe X-SHOOTER du Très Grand Télescope de l’Observatoire européen austral au Chili, des astronomes irlandais ont examiné la lumière du soleil qui se reflétaient sur 101429 et sur des astéroïdes troyens voisins.

Il s’est avéré que son spectre était presque identique à ces parties de la Lune où se trouvent des terrains rocheux ouverts telles que l’intérieur des cratères et les montagnes. D’où la conclusion que 101429 pourrait bien représenter un fragment ancien de la croûte de la Lune.

However, les chercheurs n’excluent pas d’autres explications. for example, il pourrait s’agir d’un fragment de Mars qui s’en serait détaché à la suite d’une collision ancienne, ou d’un astéroïde typique qui a acquis un spectre «lunaire» en raison de l’érosion causé par le rayonnement solaire.

Afin de tirer une conclusion finale concernant l’origine de l’astéroïde 101429, il est nécessaire de poursuivre les observations à l’aide de spectrographes plus puissants, poursuivent les scientifiques. Moreover, des données supplémentaires pourraient être obtenues lors de la mise en œuvre de futures missions martiennes qui, en route vers la Planète rouge, pourraient étudier ses astéroïdes troyens.

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Source: https://fr.sputniknews.com/sci_tech/202011051044714440-un-asteroide-en-orbite-autour-de-mars-pourrait-etre-un-fragment-de-la-lune/

Moon, Asteroid, Mars, Observation, Solar System, Natural satellite, Orbit, Mars trojan, (101429) 1998 VF31

World news – FR – Asteroid orbiting Mars could be a fragment of the Moon

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