Ucraina-Russia e vertice di Macron: Biden e Putin dicono sì, poi la smentita

Ucraina, come il conflitto vive attraverso storie e testimonianzeUcraina, giornalista Rai fermata in diretta: i soldati le hanno puntato addosso i fuciliNotizie di Esteri in tempo reale - Pag. 556

Guerra Russia-Ucraina, la Cina invoca la pace mentre Putin si aspettava un appoggioSpazio,MACD missione DART: Liciacube analizza i lunghi pennacchi di Dimorphos di Askanews   29-02-2024 - 18:22 Link copiato Loading... 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(askanews) - A distanza di un anno e mezzo dal primo impatto controllato della storia di un veicolo spaziale terrestre - la sonda DART (Double Asteroid Redirection Test) della NASA - contro un piccolo asteroide - Dimorphos a circa 10 milioni di chilometri dalla Terra - per modificarne la traiettoria e testare le capacità di difesa planetaria contro una potenziale minaccia di collisione con la Terra, il gruppo internazionale di ricerca, guidato dall'Istituto Nazionale di Astrofisica (INAF), ha potuto analizzare la composizione della nube di detriti e di polvere (plume, in inglese) espulsa dall'asteroide.L'impatto avvenuto a 22.500 Km all'ora, infatti, era stato fotografato in diretta dal piccolo cubesat italiano Liciacube (Light Italian Cubesat for Imaging of Asteroids), costruito per l'Agenzia Spaziale Italiana (Asi) dalla torinese Argotec, dopo essersi staccato da DART e i suoi strumenti hanno raccolto e inviato sulla Terra 426 immagini e importanti dati su quanto accaduto a Dimorphos - una sorta di "luna" del fratello maggiore Didymos - dopo la collisione con DART. Il materiale espulso dal cratere d'impatto - hanno spiegato, i ricercatori nello studio pubblicato dalla rivista scientifica Nature - ha formato un cono con un angolo di apertura di circa 140 gradi e una struttura complessa e disomogenea, caratterizzata da filamenti, granelli di polvere e massi singoli o raggruppati. Le immagini mostrano che la parte più interna della coda - simile a quella di una cometa - aveva un colore bluastro e diventava via via più rossa con l'aumentare della distanza da Dimorphos. La velocità dei materiali espulsi, invece, varia da poche decine di m/s fino a circa 500 metri al secondo.Poiché gli asteroidi sono ciò che resta di una fase intermedia del processo che ha portato alla formazione dei pianeti, i dati acquisiti forniscono informazioni importanti nello studio delle prime fasi di aggregazione del materiale che compone il Sistema solare.Il team scientifico italiano di LICIACube è coordinato da INAF e ASI in collaborazione con l'Istituto di fisica applicata del Consiglio Nazionale delle Ricerche (CNR-Ifac), il Politecnico di Milano, l'Università di Bologna e l'Università Parthenope di Napoli. di Askanews   29-02-2024 - 18:22 Link copiato Commenti Leggi la Netiquette

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