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Un asteroide sfiorerà la Terra questa sera, mercoledì, attorno alle 19.20 ora svizzera. Si chiama 2016 RB1, viaggia alla velocità di un proiettile, è grosso come un autobus (10 metri di diametro) e passerà a una distanza di circa 38'000 chilometri, un decimo circa di quella che ci separa dalla Luna.
Grosso come un autobus
Sarà osservabile solo dall'emisfero sud. Solo lunedì è stato possibile individuarlo, grazie a un telescopio statunitense. I calcoli di diversi osservatori internazionali, fra i quali quello di Winterthur, permettono di escludere qualsiasi rischio di collisione.
pon/ATS
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