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OUTER PLANETS
New Horizons unveils Ultima and Thule as a binary Kuiper
by Staff Writers
Laurel MD (SPX) Jan 03, 2019

Ultima and Thule.

Scientists from NASA's New Horizons mission released the first detailed images of the most distant object ever explored - the Kuiper Belt object nicknamed Ultima Thule. Its remarkable appearance, unlike anything we've seen before, illuminates the processes that built the planets four and a half billion years ago.

"This flyby is a historic achievement," said New Horizons principal investigator Alan Stern of the Southwest Research Institute in Boulder, Colorado. "Never before has any spacecraft team tracked down such a small body at such high speed so far away in the abyss of space. New Horizons has set a new bar for state-of-the-art spacecraft navigation."

The new images - taken from as close as 17,000 miles (27,000 kilometers) on approach - revealed Ultima Thule as a "contact binary," consisting of two connected spheres. End to end, the world measures 19 miles (31 kilometers) in length. The team has dubbed the larger sphere "Ultima" (12 miles/19 kilometers across) and the smaller sphere "Thule" (9 miles/14 kilometers across).

The team says that the two spheres likely joined as early as 99 percent of the way back to the formation of the solar system, colliding no faster than two cars in a fender-bender.

"New Horizons is like a time machine, taking us back to the birth of the solar system. We are seeing a physical representation of the beginning of planetary formation, frozen in time," said Jeff Moore, New Horizons Geology and Geophysics team lead. "Studying Ultima Thule is helping us understand how planets form - both those in our own solar system and those orbiting other stars in our galaxy."

Data from the New Year's Day flyby will continue to arrive over the next weeks and months, with much higher resolution images yet to come.

"In the coming months, New Horizons will transmit dozens of data sets to Earth, and we'll write new chapters in the story of Ultima Thule - and the solar system," said Helene Winters, New Horizons project manager.


Related Links
New Horizons
The million outer planets of a star called Sol


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OUTER PLANETS
The PI's Perspective: Anticipation on Ultima's Doorstep
Laurel MD (SPX) Dec 28, 2018
The New Horizons spacecraft is healthy and on final approach to the first close-up exploration of a Kuiper Belt object in history, and the farthest exploration of any world, ever. In just a few days, on New Year's Eve and New Year's Day, New Horizons will swoop three times closer to our target-2014 MU69 (nicknamed Ultima Thule)-than we flew past Pluto. The anticipation is palpable now: we are on the verge of an important scientific exploration almost 20 years in the making and, in many ways, unlik ... read more

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