LOS ANGELES cheap air max mens , Sept. 15 (Xinhua) -- After a 13-year tour of Saturn, the U.S. National Aeronautics and Space Administration (NASA)'s Cassini spacecraft made a fateful plunge into the atmosphere of the ringed planet early Friday morning, ending the mission just one month shy of its 20th launch anniversary.
"Earth received @CassiniSaturn's final signal at 7:55 a.m. ET (1155 GMT). Cassini is now part of the planet it studied," Cassini's team said on Twitter Friday morning.
The last signal was received by NASA's Deep Space Network antenna complex in Canberra, Australia.
Head of spacecraft operations Julie Webster called "loss of signal," followed by Project Manager Earl Maize announcing "end of mission" as the spacecraft began to break up in Saturn's atmosphere.
"Congratulations to you all cheap air max womens ," Maize told the team. "It's been an incredible mission, incredible spacecraft, and you are an incredible team."
The probe was running low on fuel, so the 13-year tour of the Saturn system mission had to end.
The spacecraft made a deliberate plunge into Saturn's atmosphere to avoid the small possibility of it crashing into a potentially habitable moon, in particular Enceladus.
"It's a bittersweet, but fond cheap air max shoes , farewell to a mission that leaves behind an incredible wealth of discoveries that have changed our view of Saturn and our solar system, and will continue to shape future missions and research," Michael Watkins, director of NASA's Jet Propulsion Laboratory (JPL), said in a statement.
Traveling at approximately 113,000 km per hour cheap air max online , Cassini entered Saturn's atmosphere at an altitude of about 1,915 km above the planet's estimated cloud tops about 3:31 a.m. PDT (1031 GMT), according to JPL's choreographed plan.
Then, the spacecraft stopped communicating with Earth one minute later.
Within three more minutes, Cassini's 12 scientific instruments were torn apart. Then they melted, and vaporized.
Due to the travel time for radio signals from Saturn cheap air max free shipping , which changes as both Earth and the ringed planet travel around the Sun, events took place there 83 minutes before they were observed on Earth.
This means that, the signal from that event would not be received on Earth until 83 minutes later.
Cassini has made groundbreaking scientific observations of Saturn.
Before contact was lost, eight of Cassini's 12 scientific instruments were operating during the final plunge.
In particular, the spacecraft's Ion and Neutral Mass Spectrometer was directly sampling the atmosphere's composition, which cannot be done from orbit.
As planned cheap air max australia , data from eight of Cassini's science instruments were beamed back to Earth, according to NASA.
Mission scientists will examine the spacecraft's final observations in the coming weeks for new insights about Saturn, including hints about the planet's formation and evolution, and processes occurring in its atmosphere.
Cassini's plunge brings to a close a series of 22 weekly "Grand Finale" dives between Saturn and its rings, a feat never before attempted by any spacecraft.
The probe's imaging camera has taken a last look at the Saturn system on the day before the plunge and was off during this final descent.
Launched in 1997, the 3.26-billion-U.S.-dollar Cassini-Huygens mission has been touring the Saturn system since arriving there in 2004.
The Huygens lander separated from Cassini and plopped down on the surface of Saturn's moon Titan shortly after the arrival.
The Cassini probe had been scheduled to study the Saturn system until 2008 cheap air max wholesale , but the mission was given two extensions that stretched its lifetime into 2017.
During its journey, Cassini has made numerous dramatic discoveries.
"Cassini's discovery of ocean worlds at Titan and Enceladus changed everything, shaking our views to the core about surprising places to search for potential life beyond Earth," Thomas Zurbuchen, associate administrator for NASA's Science Mission Directorate at NASA headquarters in Washington, said in a statement.
"This is the final chapter of an amazing mission cheap air max , but it's also a new beginning," Zurbuchen said.
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SAN FRANCISCO, Sept. 20 (Xinhua) -- Researchers in the United States have identified a key region within a protein that governs how accurately the gene-editing tool known as CRISPR-Cas9 homes in on a target deoxyribonucleic acid (DNA) sequence.
CRISPR is short for Clustered Regularly Interspaced Short Palindromic Repeats and Cas9 stands for CRISPR Associated Protein.
The researchers at the University of California, Berkeley http://www.cheapmaxshoesaustralia.com/ , and Massachusetts General Hospital said they have tweaked the region within the Cas9 protein to produce a hyper-accurate gene editor with the lowest level of off-target cutting to date. Identified as a master controller of DNA cutting, the protein domain known as REC3 is a target for re-engineering to further improve accuracy and to minimize the chance that CRISPR-Cas9 will edit DNA at the wrong place.
Co-first author Janice Chen, a graduate student in the lab of Jennifer Doudna, the UC Berkeley professor of molecular and cell biology who was one of the first scientists to invent CRISPR-Cas9 technology, noted in a press release that "we have found that even minor alterations in the REC3 domain of Cas9 affect the differential between on- and off-target editing, which
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