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Sir George Martin nike air vapormax grigie , the legendary music producer who shaped the Beatles into the world's most important pop music force, has died, Ringo Starr said on Twitter. He was 90 years old.

"God bless George Martin peace and love to Judy and his family," Starr tweeted.

Starr followed the message by posting a photo of the Fab Four with Martin, saying "Thank you for all your love and kindness George."

A Universal Music Group spokesman in Los Angeles confirmed Martin's death but said details were not immediately known.

Martin was referred to as the "fifth Beatle" and served as producer, collaborator and mentor to John Lennon, Paul McCartney, George Harrison and Ringo Starr.

During his six-decade career in the music industry nike air vapormax rosse , Martin produced almost all of the Beatles' recordings and also worked with Gerry & the Pacemakers, Jeff Beck, America, Cheap Trick and other acts.

He produced jazz, comedy and classical albums before signing the Beatles in 1962. The young band members were rough around the edges, but Martin saw their commercial promise.

Over the coming years, he helped score, arrange nike air vapormax bianche saldi , and produce many of the band's biggest hits, including “Yesterday” and "Love Me Do." His 1979 autobiography, "All You Need Is Ears," chronicles his discovery of the Beatles and their creative process.

Martin was knighted in 1996. In 2006, working with his son, Giles Martin, he helped develop the Beatles-inspired Cirque du Soleil show "Love" in Las Vegas, which went on to reap his two most recent Grammys.

Martin was named by Guinness World Records as the most successful producer ever nike air vapormax bianche , with more than 50 No. 1 hit records over five decades in the United States and Great Britain alone.

By Xinhua writers Quan Xiaoshu & Yu Fei

BEIJING, July 19 (Xinhua) -- Are we alone? Scientists say they are on the cusp of answering the age-old question about extraterrestrial (ET) life.

"We are lucky to be in a special era, with the next generation of giant telescopes on the way. There may be some exciting discoveries in the following 10 to 20 years," says Mao Shude, director of the Center for Astrophysics of the Beijing-based Tsinghua University.

According to mainstream scientific opinion, it is possible that extraterrestrial life exists, as the Earth is not unique in the universe. Our galaxy has hundreds of billions of stars, many with solar-like planetary systems nike air vapormax nere saldi , and there are hundreds of billions of galaxies in the universe. So it' s reasonable to infer that Earth-like planets might be common, and the universe could teem with life.

"I think primitive life is likely to be abundant, but intelligent life might be rarer," says Mao, also director of the Galaxy and Cosmology Division of the National Astronomical Observatories of China (NAOC), Chinese Academy of Sciences.

The next generation of giant telescopes might help astronomers resolve some long-standing issues, such as analyzing the spectrum of distant planets, making it possible to detect biomarkers of life.

Biomarkers are certain elements that might indicate the existence of life. An important biomarker nike air vapormax nere , oxygen molecules, without supporting life, can only last for a short time compared with the 13.7 billion-year history of the universe.

Oxygen easily reacts with other elements, and Mars appears red as a result of oxidation. "If we find a lot of oxygen molecules in the atmosphere of an extraterrestrial planet, they are probably produced by life activities," Mao explains.

wton more than 300 years ago when he discovered that larger telescopes could not form clearer images due to atmospheric distortions.

But today, after years of development, many observatories around the world nike air vapormax flyknit uomo , including those with telescopes of 8 to 10 meters in diameter, are equipped with adaptive optics systems.

Adaptive optics is a technology that aims to correct the distortions induced by atmospheric turbulence. The system is mainly composed by three parts: a wavefront sensor, a deformable mirror and a real time controller. The wavefront sensor is like the eye of the system, and it measures the light distortions a few hundred or even thousand times in one second, so that the turbulence distortion almost looks like a cartoon played frame by frame to the system; the real time controller acts like a super fast brain, and it calculates how correction should be applied and sends commands to the deformable mirror; and finally, like the hand of the system, the deformable mirror actually carries out those commands nike air vapormax flyknit saldi , and changes its surface shape accordingly to correct the distortions before the arrival of the next command.

The next generation of ground-based telescopes, including the Thirty Meter Telescope (TMT), the Giant Magellan Telescope (GMT) and the European Extremely Large Telescope (E-ELT), will have better adaptive optics systems, so they will be central to future observations, says Feng Lu, an associate researcher with the NAOC.

Compared with space telescopes, ground-based telescopes can be larger and connected to more instruments nike air vapormax 2018 saldi , and can work longer and look deeper into space. The adaptive optics technology will improve their resolution close to or even above space telescopes, making them capable of observation tasks previously impossible on the ground, such as tracking extra-solar planet candidates, Feng says.

For example, with the assistance of adaptive optics, TMT will have a resolving power and sensitivity much greater than the Hubble Space Telescope when it goes into use around mid-2020s. One of its major tasks will be to analyze the spectrum of extra-solar planets.

But the next generation of space telescopes will also revolutionize astronomy. The Transiting Exoplanet Survey Satellite (TESS), to be launched by the U.S. National Aeronautics and Space Administration (NASA) in 2017, is one of them.

Kepler nike air max 97 uomo saldi , TESS' predecessor launched by NASA in 2009, is the.