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Il sismometro della missione InSight della NASA, a cui partecipa anche il Politecnico di Zurigo, è riuscito per la prima volta a registrare l'impatto di meteoriti su Marte. Si tratta di un evento frequente, che si spiega con la vicinanza del pianeta rosso alla fascia principale di asteroidi e con la sua atmosfera rarefatta.
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Decisivo per la scoperta, secondo quanto comunicato lunedì, è stato un meteorite precipitato il 5 settembre del 2021 e frammentatosi in tre parti cadute a un centinaio di chilometri dalla stazione InSight. Le conseguenti scosse sono state rilevate e questo ha dato lo spunto ai ricercatori, che studiando i dati precedenti sono quindi riusciti a risalire a tre episodi analoghi. Altri sarebbero invece passati inosservati.
L'importanza della missione InSight spiegata da Domenico Giardini
Riccardo Ferraris/TG del 04/05/1/8 04.05.2018, 21:06
Comprendere la frequenza del fenomeno permetterebbe di determinare a posteriori in quale arco di tempo si è formata la superficie marziana con i suoi crateri. Le conoscenza acquisite sono state oggetto di un articolo uscito su "Nature Geoscience".
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