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  • NASA spacecraft survives risky encounter with faraway dark world – Al Jazeera
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NASA spacecraft survives risky encounter with faraway dark world – Al Jazeera

Editor January 2, 2019

AN UNMANNED NASA spacecraft has sent a signal back to the Earth that it has successfully made it through a risky flyby past the most distant planetary object ever studied, the American space agency said on Tuesday.

NASA rang in the New Year with a landmark flyby of the farthest, and quite possibly the oldest, cosmic body ever explored by humanity – a tiny, distant world called Ultima Thule – in the hopes of learning more about how planets took shape.

A series of anxiously awaited “phone home” signals arrived after 10:30am (15:30 GMT), indicating that the spacecraft had made it, intact, through the risky, high-speed encounter.

“We have a healthy spacecraft,” said Alice Bowman, missions operations manager for the New Horizons spacecraft, as cheers erupted in the control rooms at Johns Hopkins Applied Physics Laboratory in Maryland.

About 10 hours earlier, NASA celebrated the New Year’s flyby at 12:33am (05:33 GMT) when the New Horizons spacecraft aimed its cameras at the space rock 6.4 billion km away in a dark and frigid region of space known as the Kuiper Belt.

Images and data will start arriving later on Tuesday, offering scientists the first up-close look at an ancient building block of planets, Bowman said.

The flyby took place more than a billion kilometres beyond Pluto, which was until now the most faraway world ever visited up-close by a spacecraft.

Real-time video of the actual flyby was impossible since it takes more than six hours for a signal sent from the Earth to reach the spaceship, and another six hours for the response to arrive.

Hurtling through space at a speed of 51,200km an hour, the spacecraft aimed to make its closest approach within 3,520km of the surface of Ultima Thule.

Lead planetary scientist for New Horizons, Alan Stern, said Ultima Thule is unique because it is a relic from the early days of the solar system and could provide answers about the origins of other planets.

“The object is in such a deep freeze that it is perfectly preserved from its original formation,” he said.

“Everything we are going to learn about Ultima – from its composition to its geology to how it was originally assembled, whether it has satellites and an atmosphere and those kinds of things – are going to teach us about the original formation conditions of objects in the solar system.”

Scientists are not sure what Ultima Thule looks like, whether it is cratered or smooth, or even if it is a single object or a cluster. It was discovered in 2014 with the help of the Hubble Space Telescope, and is believed to be 19-32km in size.

A blurred and pixelated image released on Monday, taken from 1,920,000km away, has intrigued scientists because it appears to show an elongated blob, not a round space rock.

The spaceship was to collect 900 images over the course of a few seconds as it shaved by. Even clearer images should arrive over the next three days.

“Now it is just a matter of time to see the data coming down,” said deputy project scientist John Spencer of the Southwest Research Institute.

Scientists decided to study Ultima Thule with New Horizons after the spaceship, which was launched in 2006, completed its main mission of flying by Pluto in 2015, returning the most detailed images ever taken of the dwarf planet.

Stern said the goal is to take images of Ultima that are three times the resolution the team had for Pluto.(By Al Jazeera)

Link: https://www.aljazeera.com/news/2019/01/nasa-spacecraft-survives-risky-encounter-faraway-dark-world-190101154749534.html

 

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