NASA: Icy object past Pluto looks like reddish snowman

NASA’s New Horizons wept past the ancient, mysterious object on New Year’s Day

A NASA spacecraft 4 billion miles from Earth yielded its first close-up pictures Wednesday of the most distant celestial object ever explored, depicting what looks like a reddish snowman.

Ultima Thule, as the small, icy object has been dubbed, was found to consist of two fused-together spheres, one of them three times bigger than the other, extending about 21 miles (33 kilometres) in length.

NASA’s New Horizons, the spacecraft that sent back pictures of Pluto 3 1/2 years ago, swept past the ancient, mysterious object early on New Year’s Day. It is 1 billion miles (1.6 billion kilometres) beyond Pluto.

On Tuesday, based on early, fuzzy images taken the day before, scientists said Ultima Thule resembled a bowling pin. But when better, closer pictures arrived, a new consensus emerged Wednesday.

“The bowling pin is gone. It’s a snowman!” lead scientist Alan Stern informed the world from Johns Hopkins University’s Applied Physics Laboratory , home to Mission Control in Laurel. The bowling pin image is “so 2018,” joked Stern, who is with the Southwest Research Institute.

The celestial body was nicknamed Ultima Thule — meaning “beyond the known world” — before scientists could say for sure whether it was one object or two. With the arrival of the photos, they are now calling the bigger sphere Ultima and the smaller one Thule.

Thule is estimated to be 9 miles (14 kilometres) across, while Ultima is thought to be 12 miles (19 kilometres).

Scientist Jeff Moore of NASA’s Ames Research Center said the two spheres formed when icy, pebble-size pieces coalesced in space billions of years ago. Then the spheres spiraled closer to each other until they gently touched — as slowly as parking a car here on Earth at just a mile or two per hour — and stuck together.

Despite the slender connection point, the two lobes are “soundly bound” together, according to Moore.

Scientists have ascertained that the object takes about 15 hours to make a full rotation. If it were spinning fast — say, one rotation every three or four hours — the two spheres would rip apart.

Stern noted that the team has received less than 1 per cent of all the data stored aboard New Horizons. It will take nearly two years to get it all.

The two-lobed object is what is known as a “contact binary.” It is the first contact binary NASA has ever explored. Having formed 4.5 billion years ago, when the solar system taking shape, it is also the most primitive object seen up close like this.

About the size of a city, Ultima Thule has a mottled appearance and is the colour of dull brick, probably because of the effects of radiation bombarding the icy surface, with brighter and darker regions.

Both spheres are similar in colour, while the barely perceptible neck connecting the two lobes is noticeably less red, probably because of particles falling down the steep slopes into that area.

So far, no moons or rings have been detected, and there were no obvious impact craters in the latest photos, though there were a few apparent “divots” and suggestions of hills and ridges, scientists said. Better images should yield definitive answers in the days and weeks ahead.

Clues about the surface composition of Ultima Thule should start rolling in by Thursday. Scientists believe the icy exterior is probably a mix of water, methane and nitrogen, among other things.

The snowman picture was taken a half-hour before the spacecraft’s closest approach early Tuesday, from a distance of about 18,000 miles (28,000 kilometres).

Scientists consider Ultima Thule an exquisite time machine that should provide clues to the origins of our solar system.

It’s neither a comet nor an asteroid, according to Stern, but rather “a primordial planetesimal.” Unlike comets and other objects that have been altered by the sun over time, Ultima Thule is in its pure, original state: It’s been in the deep-freeze Kuiper Belt on the fringes of our solar system from the beginning.

“This thing was born somewhere between 99 per cent and 99.9 per cent of the way back to T-zero (liftoff) in our solar system, really amazing,” Stern said. He added: “We’ve never seen anything like this before. It’s not fish or fowl. It’s something that’s completely different.”

Still, he said, when all the data comes in, “there are going to be mysteries of Ultima Thule that we can’t figure out.”

Marcia Dunn, The Associated Press

Like us on Facebook and follow us on Twitter.

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Just Posted

North Delta crime beat, week of May 17

A selection of property crimes submitted weekly by the Delta Police Department

COLUMN: For real leadership amid crisis, look west of Scott Road

Delta council, under direction of Mayor George Harvie, defines leadership during pandemic

South Delta crime beat, week of May 17

A selection of property crimes submitted weekly by the Delta Police Department

Delta playgrounds, basketball hoops, reopening June 1

Skate and bike parks in the city were reopened last week

COVID-19: Daily update on the pandemic in Surrey, White Rock and beyond

MAY 29: Feds to mull border-closure exceptions for families split between Canada and U.S.

Feds looking at ways to reunite families amid COVID-19 border restrictions with U.S.

Some families with members of dual-citizenship have become separated due to the pandemic

‘Took about three minutes to kill’: Langley man finds Asian giant ‘murder hornet’ inside bedroom

The extra-large invasive insect had been first discovered in Brookswood on Thursday, May 28

Police watchdog recommends charges against five Mounties in Prince George man’s death

Police used pepper spray on the man, who then had trouble breathing before dying at the scene

B.C. tourism seeks relief as businesses wait for COVID-19 restrictions to ease

Mid-June earliest for more in-province travel to be authorized

Facing changes together: Your community, your journalists

Importance of accurate, ethical reporting more critical than ever

Man last seen walking out of Royal Columbian Hospital found dead

It is unclear how or why Gavin Deloes was able to leave the New Westminster hospital

VIDEO: Humpback whales put on quite a show

The ‘playful’ pod lingered by a Campbell River tour operator’s boat for quite some time

B.C. woman launches First Nations search, rescue and patrol program

Linda Peters envisions trained searchers ready to go at moment’s notice in each B.C. First Nation

Large cruise ships barred from Canadian waters until end of October: Garneau

Last year 140 cruise ships brought more than two million visitors to Canadian ports

Most Read