• On New Year's Day, researchers flew NASA's New Horizons probe past a snowman-shaped space rock called 2014 MU69 (or Ultima Thule).
  • MU69 orbits the sun from about 6.4 billion km away. It's the most distant object humanity has ever explored.
  • NASA's spacecraft recorded hundreds of photos of MU69, and the images are slowly trickling back to Earth.
  • Scientists animated a series of the images into a video that shows MU69 turns like an hourglass.


The most distant object humanity has ever visited looks something like a spinning snowman or hourglass that's lost in space.

Researchers who work on NASA's nuclear-powered New Horizons mission released a movie on Tuesday showing the rotation of the mountain-size rock, which is known formally as (486958) 2014 MU69.

Mu69 is about 6.4 billion km from Earth and 1.6 billion km beyond Pluto. New Horizons flew by the object on New Year's Day at a speed of 52,000 km per hour, and came within about 3,500 km of MU69.

During the flyby, the probe took a series of images that revealed its shape and spin. The animation takes 13 individual photos recorded by New Horizons over seven hours. The earliest image in the sequence was taken from a distance of about 500,000 km and the last from about 27,000 km away.

"The rotation period of Ultima Thule is about 16 hours, so the movie covers a little under half a rotation," according to a press release from Johns Hopkins University Applied Physics Laboratory, which helps run the New Horizons mission.

A low-resolution color image of MU69 (left), a high-resolution black-and-white image (center), and a merged version to show the object's color (right).

The Applied Physics Laboratory added that "the New Horizons science team will use these images to help determine the three-dimensional shape of Ultima Thule, in order to better understand its nature and origin."

These grainy images are just a fraction of what New Horizons will send back to Earth over the next two years.

Why New Horizons' data is so important

An illustration of the Kuiper Belt with New Horizons' flight path, Pluto, and 2014 MU69 (or Ultima Thule).

After New Horizons achieved the first-ever visit to Pluto in July 2015, it coasted farther into a zone called the Kuiper Belt.

In this cold and icy region, sunlight is about as weak as the light from a full moon on Earth. Frozen leftovers of the solar system's formation, called Kuiper Belt objects (KBOs), lurk in vast numbers.

Pluto is one of them, but MU69 is the most pristine and primitive objects humanity has ever studied up-close. It might have been a comet with a brilliant tail had it been tossed toward the sun, but instead the rock has stayed in its distant, freezing-cold orbit for billions of years.

"Any time we see comets, we have to remember that they're post-toasties; they've been fired, crackled, and crunched by the sun. They're badly damaged examples of former Kuiper Belt objects," Jeff Moore, a co-investigator on the New Horizons mission, said during a press briefing earlier this month.

MU69's pristine state, therefore, means it could help solve some longstanding mysteries about the solar system's 4.5 billion years of history. And the data acquired by New Horizons will likely reveal new clues about how planets like Earth formed.

For example, Alan Stern, who leads the New Horizons mission, said on January 2 that scientists had already figured out that MU69 is technically a contact binary, or "two completely separate objects now joined together."

It has also been called a bi-lobate comet - though one that's never journeyed close to the sun.

"This is exactly what need to move the modeling work on planetary formation forward, because we're seeing evidence - right here - of accreting objects, and then having them combine," Cathy Olkin, a deputy project scientist on the New Horizons mission, said during a press conference earlier this month.

Moore added that when we see comets, we may be "looking at smaller versions of very badly damaged contact binaries."

An artist's rendering of an asteroid swarm.

Stern has compared this new source of information to archaeological discoveries.

"It's like the first time someone opened up the pharaoh's tomb and went inside, and you see what the culture was like 1,000 years ago," he said. "Except this is exploring the dawn of the solar system."

NASA scientists now have to wait for data

A comparison of Pluto's moon Charon and Ultima Thule.

As with New Horizons' flyby of Pluto several years ago, researchers on the mission must now play a waiting game for more images and scientific data.

Because of New Horizons' hardware and location, each small or low-resolution picture the probe took required about two hours to transmit. Then each bit of data, moving at the speed of light as radio waves, took about six more hours to reach antennas on Earth.

So it will take far longer to get the most detailed, full-resolution images - and perhaps 20 months to download all of the MU69-flyby data.

Part of the reason for this slow pace is that the output of the spacecraft's radio antenna is now about 15 watts, or one-quarter of a standard light bulb's power. Plus, it's broadcasting from 6.4 billion km away.

New Horizons team members expect to see the highest-resolution color photos in February.

"We are guardedly optimistic that those highest-res images will cover a massive amount of the surface," Stern said on Thursday. "Stay tuned for February."

Editor's note: After a public campaign, the New Horizons team selected Ultima Thule as a nickname for (486958) 2014 MU69. However, we've de-emphasized it here because the Nazi party used the word "Thule" as a tenet of its ideology.

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