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Non solo la notte di San Lorenzo... ma quattro, dal 10 al 14 agosto, per tutti i romantici e gli appassionati che non aspettano altro per starsene con il naso all'insù. Sono questi i giorni, infatti, in cui la Terra incrocerà quest'anno la traiettoria delle Perseidi, minuscoli frammenti di roccia e ghiaccio generati dalla cometa di Swift-Tuttle e che ogni anno danno vita allo spettacolo delle "stelle cadenti" penetrando nell'atmosfera alla velocità di 250'000 km/h.
Le date sono state indicate venerdì dall'osservatorio astronomico Eschenberg di Winterthur, che precisa: la luna, piena il 21 agosto, sparirà dal cielo prima di mezzanotte e non costituirà quindi un ostacolo.
Il fenomeno è osservabile a occhio nudo e il momento migliore dovrebbe essere il 12 agosto, dopo le 21.30. Le Perseidi prendono il loro nome dalla costellazione di Perseo, dalla quale, per un effetto di prospettiva, sembrano provenire a chi le guarda dalla Terra.
RedMM
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