martedì 16 ottobre 2012

SCOPERTE

UN PIANETA CON QUATTRO SOLI Ci sono quattro soli che brillano nel cielo di un pianeta distante 5.000 anni luce dalla Terra. E’ una scoperta che sa di fantascienza e che descrive per la prima volta un pianeta che orbita attorno a due soli e che, al suo esterno ha altri due soli. E’ una sorta di valzer, nel quale i due soli all’interno dell’orbita descritta dal pianeta ruotano l’uno attorno all’altro, così come fanno i due soli all’esterno. Il pianeta e' stato chiamato PH1, che sta per Planet Hunter 1, dal nome del programma nel quale astronomi dilettanti utilizzano i dati di risulta di Kepler, il telescopio della Nasa specializzato nel dare la caccia ai pianeti esterni al Sistema Solare. E' stato così che, analizzando materiale non considerato di primo piano, gli astrofili americani Kian Jek e Robert Gagliano hanno individuato il pianeta, il primo scoperto dal programma Planet Hunter. La scoperta, in via di pubblicazione sull'Astrophysical Journal, e' stata confermata da un gruppo internazionale di astronomi coordinato dall'universita' statunitense di Yale e presentata a Reno, nel congresso della Societa' Astronomica Americana. ''E' senza dubbio un pianeta'', ha commentato l'astrofisico Gianluca Masi, del Virtual Telescope. ''E' un bel risultato che nasce da un programma di ricerca diffusa - ha aggiunto - e che segna il punto d'incontro fra la ricerca basata sui dati della sonda Kepler e gli appassionati di astronomia che offrono il loro supporto''. Per l'astronomo Raffaele Gratton, dell'osservatorio di Padova dell'Istituto Nazionale di Astrofica (Inaf) ''e' il primo pianeta con quattro stelle finora scoperto, finora il telescopio Kepler ha scoperto solo pochissimi pianeti con due soli. Questi sistemi non sono affatto facili da individuare ed e' possibile farlo solo con strumenti molto particolari''. Il pianeta PH1 e' grande come Nettuno e sei volte piu' denso della Terra. Impiega 137 giorni a ruotare attorno alle due stelle interne, vale a dire che si trova da esse ad una distanza che e' circa la meta' rispetto a quella che separa la Terra dal Sole. Gli altri due soli quotano invece all'esterno del pianeta e sono molto lontani, ad una distanza 900 volte maggiore a quella fra a Terra e il Sole. Sono cosi' vicini tra loro e lontanissimi da PH1 da apparire nel cielo del pianeta come un'unica stella brillante. .
LETTO SU http://www.ansa.it/scienza _________________________________________________________________________________ IL PIANETA DI DIAMANTI E' una scoperta decisamente preziosa quella di un team di scienziati provenienti dagli Stati Uniti e dalla Francia. Un pianeta localizzato nella Costellazione del Cancro e denominato 55 Cancri E, fu scoperto nel 2004 e misurato per la prima volta nel 2011 dal Telescopio Spaziale Spitzer e subito si contraddistinse per la sua superficie due volte quella del nostro pianeta. Lo scenario che si è aperto agli occhi degli astronomi è stato quello di un pianeta che, secondo le prime stime, sarebbe interamente costituito di diamanti. Pianeti e planetoidi di diamante sono già stati individuati in passato. Tuttavia, 55 Cancri è il primo individuato di tali dimensioni e il primo ad avere una regolare orbita attorno alla propria stella. Tra le altre caratteristiche, una velocità attorno alla propria stella della durata di circa 18 ore. La temperatura, inoltre, si aggira attorno ai 1,648 gradi. Inoltre, la sua massa è otto volte più grande. Lo studio su 55 Cancri è stato condotto da una cooperazione di esperti della Yale University, l'Istitute de Recherche En Astrophysique et Planetologie dell'Università di Toulouse, in Francia. Uno degli astronomi e ricercatore di fisica, Nikku Madhusudhan sostiene che "la superficie di questo pianeta probabilmente è coperta di grafite e diamante piuttosto che di acqua e granito". La stella attorno a cui ruota il pianeta è visibile a occhio nudo, sebbene si trovi a 40 anni luce dalla Terra come dimostra la mappa dello Smithsonian Institute. Non brilla particolarmente e sembra sia composta principalmente da carbonio, ferro e carburo di silicio. E, almeno un terzo del pianeta, è probabile sia composto da carbonio sotto forma di diamante.
LETTO SU http://www.nextme.it/scienza

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