A NASA spacecraft has rocketed toward the sun on an unprecedented quest to get closer to our star than anything ever sent before.
The Parker Solar Probe will fly straight through the wispy edges of the corona, or outer solar atmosphere, that was visible during last August’s total solar eclipse.
It eventually will get within 6 million kilometres of the sun’s surface, staying comfortably cool despite the extreme heat and radiation, and allowing scientists to vicariously explore the sun in a way never before possible.
Saturday morning’s launch attempt was foiled by last-minute technical trouble and postponed by a day.
But what better day to launch to the sun than Sunday, as NASA noted.
“Fly baby girl, fly!!” project scientist Nicola Fox of Johns Hopkins University tweeted just before lift-off. She urged it to “go touch the sun!”
Protected by a revolutionary new carbon heat shield and other high-tech wonders, the spacecraft will zip past Venus in October.
That will set up the first solar encounter in November.
Altogether, the Parker probe will make 24 close approaches to the sun on the seven-year, $1.5 billion undertaking.
Space probe’s 91-year-old namesake attends launch
For the second straight day, thousands of spectators jammed the launch site in the middle of the night as well as surrounding towns, including 91-year-old astrophysicist Eugene Parker, for whom the spacecraft is named.
He proposed the existence of solar wind — a steady, supersonic stream of particles blasting off the sun — 60 years ago.
It was the first time NASA named a spacecraft after someone still alive, and Parker wasn’t about to let it take off without him.
“I’m just so glad to be here with him,” said NASA’s science mission chief, Thomas Zurbuchen.
“Frankly, there’s no other name that belongs on this mission.”
It was the first rocket launch ever witnessed by Parker, professor emeritus at the University of Chicago.
He came away impressed, saying it was like looking at the Taj Mahal for years in photos and then beholding “the real thing” in India.
“I really have to turn from biting my nails in getting it launched, to thinking about all the interesting things which I don’t know yet and which will be made clear, I assume, over the next five or six or seven years,” Parker said on NASA TV.
The Delta IV Heavy rocket thundered into the pre-dawn darkness, thrilling onlookers for miles around.
NASA needed the mighty 23-story rocket, plus a third stage, to get the Parker probe — the size of a small car and well under a ton — racing toward the sun.
From Earth, it is 150 million kilometres to the sun, and the Parker probe will be within 4 per cent of that distance. That will be seven times closer than any previous spacecraft.
Parker will start shattering records this fall. On its very first brush with the sun, it will come within 25 million kilometres, easily beating the current record set by NASA’s Helios 2 spacecraft in 1976.
By the time Parker gets to its 22nd orbit of the sun, it will be even deeper into the corona and traveling at a record-breaking 690,000 kilometres per hour.
Nothing from Planet Earth has ever hit that kind of speed.
Even Ms Fox has difficulty comprehending the mission’s derring-do.
“To me, it’s still mind-blowing,” she said. “Even I still go, really? We’re doing that?”
SOURCE: ABC News