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.

Just Posted

Small slide reaches highway’s edge east of Canoe

Ministry to monitor site, otherwise no concerns reported in area

Shuswap Search and Rescue pleased with provincial funding announcement

Search manager says the volunteer group is growing busier, funds will be put to good use

Salmon Arm artist receives prestigious designation from Federation of Canadian Artists

Justin Maas, renowned for his pastel portraits, is now a senior signature member of the federation

Warning issued after construction materials burned

Salmon Arm Fire Department emphasizes it is illegal to burn scraps from building sites

Salmon Arm’s Shoemaker Hill opens after snowy winter

Spring officially comes to city as city crews open steep hill on Monday, March 25

VIDEO: The ‘most cosmopolitan’ of butterflies could migrate to B.C.

The painted lady butterfly will likely arrive this summer from Southern California

SPCA seizes 54 animals from Vernon property

Animals weren’t receiving adequate care

West Kelowna acquires land for Rose Valley Water Treatment Plant

The city has acquired 24 acres on Bartley Road

Is it a homicide? B.C. woman dies in hospital, seven months after being shot

Stepfather think Chilliwack case should now be a homicide, but IHIT has not confirmed anything

Indecent caller handed 18-month conditional sentence

Vancouver Island man pleaded guilty to making indecent phone and video calls to women across B.C.

Sources say Trudeau rejected Wilson-Raybould’s conservative pick for high court

Wilson-Raybould said Monday “there was no conflict between the PM and myself”

First Nations public art piece stolen in Nanaimo

Spindle Whorl went missing over the weekend, according to Nanaimo RCMP

RV lifestyle comes to the Okanagan

BC Interior RV Show returns to Penticton for the eighth year

Father-son duo at B.C. Children’s Hospital helps new dads fight depression

The pair teamed up to introduce the only known research-based mindfulness workshop for new dads

Most Read