LAUREL, MD.
The
NASA spacecraft that yielded the first close-up views of Pluto opened the new
year at an even more distant world, a billion miles beyond.
Flight
controllers said everything looked good for New Horizons' flyby of the tiny,
icy object at 12:33 a.m. Tuesday. Confirmation was not expected for hours,
though, given the vast distance.
The
mysterious, ancient target nicknamed Ultima Thule is 4 billion miles (6.4
billion kilometers) from Earth.
Scientists
wanted New Horizons observing Ultima Thule during the encounter, not phoning
home. So they had to wait until late morning before learning whether the
spacecraft survived.
With
New Horizons on autopilot, Mission Control was empty at Johns Hopkins
University's Applied Physics Laboratory in Laurel, Maryland. Instead, hundreds
of team members and their guests gathered nearby on campus for back-to-back
countdowns.
The
crowd ushered in 2019 at midnight, then cheered, blew party horns and
jubilantly waved small U.S. flags again 33 minutes later, the appointed time
for New Horizons' closest approach to Ultima Thule.
A few
black-and-white pictures of Ultima Thule might be available following Tuesday's
official confirmation, but the highly anticipated close-ups won't be ready
until Wednesday or Thursday, in color, it is hoped.
"We
set a record. Never before has a spacecraft explored anything so far
away," said the project's lead scientist who led the countdown to the
close encounter, Alan Stern of Southwest Research Institute. "Think of it.
We're a billion miles farther than Pluto."
Stern
called it an auspicious beginning to 2019, which will mark the 50th anniversary
of Neil Armstrong and Buzz Aldrin's footsteps on the moon in July 1969.
"Ultima
Thule is 17,000 times as far away as the 'giant leap' of Apollo's lunar
missions," Stern noted in an opinion piece in The New York Times.
New
Horizons, which is the size of a baby grand piano and part of an $800 million
mission, was expected to hurtle to within 2,200 miles (3,500 kilometers) of
Ultima Thule, considerably closer than the Pluto encounter of 2015.
Its
seven science instruments were to continue collecting data for four hours after
the flyby. Then the spacecraft was to turn briefly toward Earth to transmit
word of its success. It takes over six hours for radio signals to reach Earth
from that far away.
Scientists
believe there should be no rings or moons around Ultima Thule that might
endanger New Horizons. Traveling at 31,500 mph (50,700 kph), the spacecraft
could easily be knocked out by a rice-size particle. It's a tougher encounter
than at Pluto because of the distance and the considerable unknowns, and
because the spacecraft is older now.
"I
can't promise you success. We are straining the capabilities of this
spacecraft," Stern said at a news conference Monday. "By tomorrow,
we'll know how we did. So stay tuned. There are no second chances for New
Horizons."
The
risk added to the excitement.
Queen
guitarist Brian May, who also happens to be an astrophysicist, joined the team
at Johns Hopkins for a midnight premiere of the rock 'n' roll song he wrote for
the big event.
"We
will never forget this moment," said May who led the New Year's countdown.
"This is completely unknown territory."
Despite
the government shutdown, several NASA scientists and other employees showed up
at Johns Hopkins as private citizens, unwilling to miss history in the making.
Ultima
Thule was unknown until 2014, eight years after New Horizons departed Earth. It
was discovered by the Hubble Space Telescope and added to New Horizons'
itinerary.
Deep
inside the so-called Kuiper Belt, a frigid expanse beyond Neptune that is also
known as the Twilight Zone, Ultima Thule is believed to date back 4.5 billion
years to the formation of our solar system. As such, it is "probably the
best time capsule we've ever had for understanding the birth of our solar
system and the planets in it," Stern said.
In
classic and medieval literature, Thule was the most distant, northernmost place
beyond the known world.
Scientists
suspect Ultima Thule is a single object no more than 20 miles (32 kilometers)
long, though there's a chance it could prove to be two smaller bodies orbiting
each other or connected by a slender neck. It is thought to be potato-shaped
and dark-colored with a touch of red, possibly from being zapped by
cosmic rays for eons.
The
exact shape and composition won't be known until Ultima Thule starts sending
back data in a process expected to last almost two years.
"Who
knows what we might find? ... Anything's possible out there in this very
unknown region," said John Spencer, a deputy project scientist from
Southwest Research Institute. "We'll find out soon enough."
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