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New color images from NASA's New Horizons spacecraft show two very different faces of Pluto, one with a series of intriguing spots along the equator that are evenly spaced/AFP

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US spacecraft whizzes by Pluto in historic flyby

New color images from NASA's New Horizons spacecraft show two very different faces of Pluto, one with a series of intriguing spots along the equator that are evenly spaced/AFP

New color images from NASA’s New Horizons spacecraft show two very different faces of Pluto, one with a series of intriguing spots along the equator that are evenly spaced/AFP

LAUREL, Jul 14- An unmanned NASA spacecraft whizzed by Pluto on Tuesday, making its closest approach in the climax of a decade-long journey to explore the dwarf planet for the first time, the US space agency said.

Moving faster than any spacecraft ever built — at a speed of about 30,800 miles per hour (49,570 kph) — the flyby happened at 7:49 am (1149 GMT), with the probe running on auto-pilot. It was to pass by Pluto at a distance of 7,767 miles (12,500 kilometers).

“The New Horizons spacecraft passes its closest approach mark at Pluto after a three-billion-mile journey,” a NASA commentator said as spectators waved flags in a crowded room at the Johns Hopkins Applied Physics Center outside the US capital, Washington.

“I have to pinch myself. Look what we accomplished,” mission operations manager Alice Bowman said.

“It is truly amazing that humankind can go out and explore these worlds and to see Pluto be revealed just before our eyes. It is just fantastic.”

New Horizons principal investigator Alan Stern described what he called “a moment of celebration,” with the promise of a “16-month data waterfall” ahead that will help scientists write whole new textbooks about Pluto.

“We have completed the initial reconnaissance of the solar system, an endeavor started under President (John F.) Kennedy more than 50 years ago, continuing today under President (Barack) Obama,” Stern told reporters.

– Pioneer mission –

Never before has a spacecraft ventured into the Kuiper Belt, and New Horizons has been on its way there for more than nine years.

The spacecraft launched in 2006, the same year that Pluto was downgraded to “dwarf planet” status due to the celestial body’s small size.

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New Horizons is the first spacecraft to fly past Pluto, and its seven scientific instruments aim to reveal up-close details of the surface, geology and atmosphere of Pluto and its five moons.

Already, scientists have learned from New Horizons that Pluto is 20-30 kilometers larger than previously thought, with a radius of 736 miles (1,185 kilometers).

Scientists have also confirmed the existence of a polar ice cap on Pluto, and found nitrogen escaping from Pluto’s atmosphere.

“This is truly a hallmark in human history,” said NASA’s head of the science mission directorate, John Grunsfeld.

The nuclear-powered spacecraft has enough fuel to carry on its exploration for years to come.

Stern has said he plans to ask NASA for funding to continue using New Horizons beyond its Pluto mission.

But first, scientists need to know if it survived the chaotic Kuiper Belt, the region beyond Neptune which Stern has described as a “shooting gallery” of cosmic debris.

NASA expects to receive a signal from the spacecraft later this evening, at 9:02 pm (0102 GMT Wednesday) to find out whether or not the spacecraft made it through intact.

Experts said there was a one in 10,000 chance that the baby grand piano-sized spacecraft could collide with debris.

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“I am feeling a little bit nervous just like you do when you send your child off,” said Bowman.

“But I have absolute confidence that it is going to do what it needs to do and it is going to turn around and send us that burst of data and tell us that it is okay.”

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