http___metro-portal.hr_sonda-dawn-usla-u-orbitu-veste_61389_1.xml
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NASA to Reveal New Vesta Discoveries by Asteroid Probe Thursday NASA will showcase the latest discoveries from an asteroid probe orbiting the huge space rock Vesta on Thursday (May 10) in a press conference for reporters and the general public. The conference, which will begin at 2 p.m. EDT (1700 GMT) on Thursday, will present a new analysis of Vesta based on the latest observations from NASA's Dawn spacecraft, which has been orbiting the asteroid since last July. The $466 million Dawn spacecraft launched in 2007 on a mission to visit two huge space rocks in the asteroid belt that orbits the sun between the orbits of Mars and Jupiter. Vesta is the brightest asteroid in the solar system and second most massive object in the asteroid belt, is Dawn's first stop. Dawn arrived in orbit around Vesta in July 2011. [Photos: Asteroid Vesta by Dawn Probe] On Thursday, NASA will broadcast the press conference on Dawn's new findings about Vesta live via its NASA TV channel. The event will also be webcast online at: http://www.nasa.gov/ntv Participants for the press conference include: - Carol Raymond, Dawn deputy principal investigator, NASA's Jet Propulsion Laboratory, Pasadena, Calif. - Harry McSween, chair, Dawn surface composition working group, University of Tennessee, Knoxville - Vishnu Reddy, Dawn framing camera team member, Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany; and the University of North Dakota, Grand Forks - David O'Brien, Dawn participating scientist, Planetary Science Institute, Tucson, Ariz. - Maria Cristina De Sanctis, Dawn co-investigator and visible and infrared mapping spectrometer team lead, Italian National Institute for Astrophysics, Rome NASA plans to stream the event live on Ustream here: http://www.ustream.com/nasajpl2 The space agency's social media fans can also ask questions about Vesta via Twitter by using the hashtag #asknasa, NASA officials said in an announcement. Last month, NASA extended Dawn's stay at Vesta by an extra 40 days to give the spacecraft more time to study the asteroid. So far, the spacecraft has revealed that many new details about Vesta, including that it is rich in iron and magnesium, and experiences chilly temperatures that range from minus 10 degrees Fahrenheit (minus 23 degrees Celsius) in the sunlight, to minus150 degrees F (minus 100 degrees C) in shadowed areas. Scientists think Vesta is a 4.5 billion-year-old relic left over from the formation of the solar system. NASA's Dawn spacecraft is the first spacecraft ever aimed at visiting two asteroids in the asteroid belt. In August the probe will move on to the Texas-size Ceres, the largest object in the asteroid belt and a space rock so large it is considered a dwarf planet. The Dawn probe is expected to arrive at Ceres in February 2015. This story was provided by SPACE.com, a sister site to LiveScience. Follow SPACE.com for the latest in space science and exploration news on Twitter @Spacedotcom and on Facebook.
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Sonda Dawn ušla u orbitu Veste Dawn je prva letjelica koja kruži u orbiti jednog objekta u glavnom asteroidnom pojasu između Marsa i Jupitera Robotska sonda NASA-e nakon četiri godine putovanja ušla je u orbitu asteroida Veste kako bi počela proučavanje drugog najvećeg objekta u asteroidnom pojasu između Marsa i Jupitera, priopćila je u nedjelju NASA, a prenosi Hina. Sonda "Dawn" poslala je signal kontroli misije u Pasedeni kako bi potvrdila ulazak u orbitu Veste, udaljene 188 miliona kilometara od Zemlje. Dawn je prva letjelica koja kruži u orbiti jednog objekta u glavnom asteroidnom pojasu između Marsa i Jupitera i također će biti prvi svemirski brod koji će obići dvije lokacije u Sunčevom sustavu ne računajući Zemlju, navodi NASA. "Proučavanje asteroida Veste predstavlja veliko znanstveno dostignuće i također ukazuje na buduća odredišta na koja će ljudi putovati idućih godina", izjavio je administrator NASA-e Charles Bolden u priopćenju. Sonda je lansirana prema Vesti 2007. godine u misiju ispitivanja nastanka Sunčevog sustava prije 4,5 milijardi godina. Cijena misije je 466 milijuna dolara. Dawn će proučavati asteroid punih godinu dana, a zatim će u srpnju 2012. godine krenuti prema drugom odredištu - patuljastom planetu Cereri. Vesta i Cerera dva su najveća protoplaneta Sunčeva sustava. To su stjenovita tijela koja koja nemaju dovoljnu masu da bi bila proglašena planetima. Oba se nalaze u pojasu između Marsa i Jupitera. "Radi se o dva posljednja neistražena svijeta u našem sustavu", rekao je voditelj projekta Robert Mase. Znanstvenici vjeruju da je Vesta sa svojom željeznom jezgrom i mogućim tokovima lave sličnija Zemlji ili Mjesecu od bilo kojeg drugog asteroida iz ovog pojasa. Cerera, iako blizu Veste, mnogo više nalikuje na Jupiter ili Saturn.