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La sonda spaziale Dawn ha raggiunto venerdì alle ore 13,39 l'orbita del pianeta Cerere, dopo un viaggio di quasi 8 anni. Dawn, spiegano gli esperti da Pasadena, era a circa 61.000 chilometri da Cerere quando è stata catturata dalla gravità del pianeta nano.
''Dopo un viaggio di 4,9 miliardi di chilometri e 7,5 anni, Dawn è arrivata a casa'', ha detto Marc Rayman, direttore della missione. Cerere ha il diametro di 950 chilometri ed è il corpo celeste più grande della fascia di asteroidi compresa fra Marte e Giove.
''Fin dalla sua scoperta,ha osservato Rayman - è stato prima definito un pianeta, poi un asteroide e poi un pianeta nano''. Solo ora con la visita di Dawn si potranno comprendere la sua origine e la sua evoluzione. Andrà scoperta anche la natura delle enigmatiche luci individuate sulla superficie mentre si stava avvicinando al pianeta nano. La missione è costata circa mezzo miliardo di dollari.
ATS/sdr
Dal TG20:
06.03.2015: Ceres, pianeta misterioso
RSI Info 06.03.2015, 21:53
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