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Una serie di terremoti sta sconvolgendo una stella dal campo magnetico incredibilmente forte, che non smette di essere attiva ed è inspiegabilmente longeva rispetto alle sue simili. Ad analizzare i bizzarri comportamenti di questo astro posto nel centro della Via Lattea sono ricercatori dell'Università dell'Insubria, a Como, di cui riferisce un mensile d'astronomia britannico.
Appartenente alla categoria delle magnetar, e quindi con un diametro di una ventina di chilometri appena, questo corpo celeste ha rivelato la sua presenza nel 2013 e da allora il suo strano comportamento è tenuto sotto osservazione.
L'instabile campo magnetico delle magnetar è talmente potente da riconfigurarsi improvvisamente e portare alla frattura dello starato più esterno, una crosta spessa un migliaio di metri, generando energie elevatissime. Solitamente, queste emissioni sono destinate a diminuire lentamente fin quasi a scomparire. Quel che appunto non succede su SGR 1745-2900.
ANSA/dg
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