Tuesday 30 April 2024

Webb Captures Top of Iconic Horsehead Nebula in Unprecedented Detail.

Extract from NASA

Stars and Galaxies

April 29, 2024

Horsehead Nebula

The Horsehead Nebula, imaged by the NIRCam instrument on NASA’s Webb Telescope, features a portion of the horse’s “mane” about 0.8 light-years wide. The blue clouds at the bottom of the image are dominated by cold, molecular hydrogen. Red wisps above the nebula represent mainly atomic hydrogen gas.

Credit: NASA, ESA, CSA, K. Misselt (University of Arizona) and A. Abergel (IAS/University Paris-Saclay, CNRS) 

The mid-infrared instrument (MIRI), managed through launch by NASA-JPL, helped reveal for the first time the small-scale structures of the nebula’s edge.

NASA’s James Webb Space Telescope has captured the sharpest infrared images to date of a zoomed-in portion of one of the most distinctive objects in our skies, the Horsehead Nebula. These observations show the top of the “horse’s mane,” or edge of this iconic nebula, in a whole new light, capturing the region’s complexity with unprecedented spatial resolution.

The “mane” of the Horsehead Nebula

The “mane” of the Horsehead Nebula is shown here imaged by Webb’s MIRI instrument. The mid-infrared light captured by MIRI reveals substances like dusty silicates and soot-like molecules called polycyclic aromatic hydrocarbons.

Credit: NASA, ESA, CSA, K. Misselt (University of Arizona) and A. Abergel (IAS/University Paris-Saclay, CNRS)

Webb’s new images show part of the sky in the constellation Orion (“The Hunter”), in the western side of a dense region known as the Orion B molecular cloud. Rising from turbulent waves of dust and gas is the Horsehead Nebula, otherwise known as Barnard 33, which resides roughly 1,300 light-years away.

The nebula formed from a collapsing interstellar cloud of material and glows because it is illuminated by a nearby hot star. The gas clouds surrounding the Horsehead have already dissipated, but the jutting pillar is made of thick clumps of material and therefore is harder to erode. Astronomers estimate that the Horsehead has about 5 million years left before it, too, disintegrates. Webb’s new view focuses on the illuminated edge of the top of the nebula’s distinctive dust and gas structure.

The Horsehead Nebula is a well-known photodissociation region, or PDR. In such a region, ultraviolet (UV) light from young, massive stars creates a mostly neutral, warm area of gas and dust between the fully ionized gas surrounding the massive stars and the clouds in which they are born. This UV radiation strongly influences the chemistry of these regions and acts as a significant source of heat.

These regions occur where interstellar gas is dense enough to remain mostly neutral, but not dense enough to prevent the penetration of UV light from massive stars. The light emitted from such PDRs provides a unique tool to study the physical and chemical processes that drive the evolution of interstellar matter in our galaxy, and throughout the universe from the early era of vigorous star formation to the present day.

Due to its proximity and its nearly edge-on geometry, the Horsehead Nebula is an ideal target for astronomers to study the physical structures of PDRs and the molecular evolution of the gas and dust within their respective environments, and the transition regions between them. It is considered one of the best regions in the sky to study how radiation interacts with interstellar matter.

Horsehead Nebula

The “mane” of the Horsehead Nebula is shown here imaged by Webb’s MIRI instrument. The mid-infrared light captured by MIRI reveals substances like dusty silicates and soot-like molecules called polycyclic aromatic hydrocarbons.

Credit: ESA/Euclid/Euclid Consortium/NASA, image processing by J.-C. Cuillandre (CEA Paris-Saclay), G. Anselmi, NASA, ESA, and the Hubble Heritage Team (AURA/STScI), ESA/Webb, CSA, K. Misselt (University of Arizona), M. Zamani (ESA/Webb)

Thanks to Webb’s MIRI and NIRCam instruments, an international team of astronomers has revealed for the first time the small-scale structures of the illuminated edge of the Horsehead. As UV light evaporates the dust cloud, dust particles are swept out away from the cloud, carried with the heated gas. Webb has detected a network of thin features tracing this movement. The observations have also allowed astronomers to investigate how the dust blocks and emits light, and to better understand the multidimensional shape of the nebula.

Next, astronomers intend to study the spectroscopic data that has been obtained to gain insights into the evolution of the physical and chemical properties of the material observed across the nebula.

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These observations were taken in the Webb GTO program 1192, and the results were published today in Astronomy & Astrophysics.

More About the Mission

The James Webb Space Telescope is the world's premier space science observatory. Webb is solving mysteries in our solar system, looking beyond to distant worlds around other stars, and probing the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and the Canadian Space Agency.

MIRI was developed through a 50-50 partnership between NASA and ESA. JPL led the U.S. efforts for MIRI, and a multinational consortium of European astronomical institutes contributes for ESA. George Rieke with the University of Arizona is the MIRI science team lead. Gillian Wright is the MIRI European principal investigator.

The MIRI cryocooler development was led and managed by JPL, in collaboration with Northrop Grumman in Redondo Beach, California, and NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Monday 29 April 2024

Channel Country blooms as floodwaters transform outback desert, stunning tourists.

Extract from ABC News 

ABC News Homepage


Behind the bar of the Betoota Hotel, Robert "Robbo" Haken is this year fielding a common question from tourists passing through on their way to Birdsville. 

 "They're all just [asking], 'Where's the desert?'," he said.

"They can't see the desert because all the green is growing over the sand."

Through a doorway, Robbo Haken sitting behind the bar at the Betoota Hotel.
Robbo Haken bought the Betoota Hotel in 2017.()

Famously "red dirt country", Queensland's far west is instead a blanket of vivid green, the result of months-long flooding through the desert.

The dusty single-lane highway into Birdsville, 1,500 kilometres west of Brisbane, is lined with lush grass, dotted with yellow and purple wildflowers.

Yellow flowers growing next to cracked red claypan.
Yellow and purple wildflowers scatter the desert.()

For Mr Haken, it's a special sight.

" I don't think you're ever gonna see it quite as pretty as what it is at the moment," he said.

"It's just something totally different from what we're used to seeing."

Earlier this year, ex-tropical cyclone Kirrily drenched the state's north, with water travelling hundreds of kilometres south to the Channel Country towards the Kati-Thanda Lake Eyre basin in South Australia.

Rivulets in the channel country as seen from the sky.
The best view of the Channel Country is from the sky.()

Birdsville, a town of 110 in the Channel Country — where the Northern Territory, Queensland and New South Wales borders meet — became an inland sea.

And when the water receded, the landscape bloomed.

An ariel view of the highway into Birdsville with floodwaters on one side and bright green on the other.
The highway to Birdsville from Windorah.()

Tourists 'flabbergasted'

Behind Birdsville's iconic red sand dunes, the horizon slowly changes into a wetland.

Big Red Tours owner Alex Oswald said tourists were "flabbergasted."

A tour bus parked on a red sand dune with people standing around and the sun setting in front.
Alex Oswald started his tour business around three years ago.()

"I've never seen so many pelicans," he said.

Scenic photos taken around Birdsville and in the Channel Country, far west Queensland.
There are squadrons of pelicans at the old Diamantina Crossing at Birdsville.()

"It doesn't go hand in hand with [the desert] that we've got pelicans flying over the top and having a good feed on the Diamantina Crossing that's usually dry.

"If you fly over the area, it's just a massive carpet of green."

Seen through the window of a plane, a rivulet of water running through a vast expanse of greenery.
The view through the window of a plane.()

Tourist Brie Dickson said it was a different picture to the one she had imagined.

"It's a bit of mixture between red and green, which is really cool to see, two contrasting colours like that," she said.

Brie Dickson sits in the front seat of her landcruiser with her brown dog peeking through the back.
Ms Dickson has been on the road since 2022.()

"It definitely would have been less green in my mind."

Pilot Jonathon Rae has the best view in Birdsville as he flies tourists over the flourishing country.

"It's just exploded with colours," he said.

Jonathan Rae beside a cesna 210 plane doing a safety debrief with tourists.
Jonathan Rae is back for his second season as a pilot in Birdsville.()

"All the dormant seedlings that lay underneath that cracked claypan just explode to life, so you get this abundance of colours, greenery, wildflowers shooting through."

From the air, the meandering pathways of floodwaters glisten in the rising sun.

"You wouldn't believe that it was in the middle of the desert," Mr Rae said.

"You really have to see it from above to believe it."

A change of fate for graziers

While the sights are not always this pretty, seasonal flooding in the outback is not out of the ordinary, with tourism and agriculture depending on the annual inflows.

Despite the flooding, Diamantina remains one of the only two drought-declared shires in the state. 

A cow stands by a body of water and bright green grass.
Cattle around Birdsville are fat on feed.()

Before the flood, fifth-generation grazier Kerry Morton was in the process of destocking his cattle on Roseberth Station from 8,000 to 5,000.

"Now I'm sitting sweet," he said.

"I'm hoping [the feed] will hold me for maybe eight months."

Mr Morton has seen floods and droughts in the outback, but said it was still "nerve-wracking" to watch water fill the distant horizon.

A side profile of Kerry Morton's face.
Kerry Morton runs Roseberth station with his father.()

"It behaved a bit like 2019 where it came through as a wall," he said.

"I thought it was going to come through quick but it actually travelled forward and slow."

Roads damaged but tourists welcome

While the floodwaters are a blessing for tourism and agriculture, they have been a headache for the local council.

Diamantina Shire mayor Francis Murray said the water damage to the roads was "in the millions".

He was aware there was a ticking clock on these repairs with the tourist season commencing this month.

Grass either side of a dirt road, blue sky and a bird flying across.
Lush greenery lines tracks around Birdsville.()

"It's important that we get those roads sorted before the influx of caravans," he said.

But according to the mayor, the region looks "as good as you'll see".

Sunday 28 April 2024

How tabloid headlines, fake news and an Australian editor have become the story at Donald Trump's trial.

Extract from ABC News 

ABC News Homepage


There's something deeply meta about a bunch of journalists sitting in court bashing out detailed notes on the behind-the-scenes workings of chequebook journalism.

Most of us not in that world know money changes hands – but $US10,000 ($15,306) without any questions being asked?

David Pecker, the former CEO of American Media (AMI), said that's how much leeway he gave the editors of his publications when he was boss.

If any "source" was asking for more for some salacious piece of celebrity news, it had to be okayed by him.

The revelation is certainly going to make me feel less bad next time I have to tell my editors I didn't manage to secure an interview with a key player in some huge story.

And it's just one of the many lessons given to jurors about the dark arts of tabloid journalism during Donald Trump's criminal trial.

Dubious headlines

The first week of evidence has centred on what was going on at Pecker's National Enquirer – a gossip rag which was sold at supermarket check-outs, specialising in celebrity scuttlebutt, true crime drama and chequebook scoops.

Before the 2016 election, it added another specialty: pumping up Trump, and tearing down anyone who threatened his path to the presidency.

Two front pages of the National Enquirer show unflattering photos of Hillary Clinton with negative headlines.
The National Enquirer ran hit jobs on Donald Trump's opponents.(ABC News)

Some of this was traditional tabloid campaigning — promoting Trump through headlines like how he'd be the "Healthiest Individual Ever Elected", and smearing rivals like "Bungling Surgeon Ben Carson" (accused of leaving a sponge in a patient's brain) and "Pervy Ted Cruz" (who was supposedly caught cheating with five mistresses).

Those dubious headlines were displayed in the courtroom this week – evidence, prosecutors argued, of the unusual relationship between Trump and the tabloid.

At the time — after Cruz suggested Trump was behind the five-mistresses story — Trump issued a statement that said: "I have nothing to do with the National Enquirer." And AMI told CNN "no-one influences" its reporting other than its reporters and editors.

But during his week in the witness stand, Pecker laid out a secret deal he made in 2015 with Trump and Trump's lawyer, Michael Cohen, that ceded extraordinary control over what went to print.

Bearing witness

It's fascinating to have a front-row seat in the first criminal trial of a US president, and a surreal insight into what it's like being in the proximity of a very, very important person.

There's a long wait and several security checks before you get into the courtroom, and once you're there, it's frequently locked down.

That means no-one is able to go in or out because the former president is on the move nearby.

Eating and drinking anything but water is strictly forbidden, and toilet breaks are infrequent and tightly controlled.

People desperately raise their hands like kids in a classroom to ask if they may use the toilet. Reporters scoff food in the line for the bathroom during breaks, because there's no time to both eat and relieve yourself.

Donald Trump sits behind a desk with his hands crossed on a pile of white documents
Donald Trump is required to attend every day of the trial.(Sarah Yenesel/Pool via Reuters)

"A bunch of us have been eating PB&Js [peanut butter and jam sandwiches] in the restroom because they won't let us eat in the hallways," I hear a male reporter confide to a colleague in the line to get into the court.

It's in that line I run into Lachlan Cartwright, an Australian reporter for whom the word "meta" probably doesn't go far enough.

He worked for Pecker as executive editor at the National Enquirer at the time. He now characterises the paper as a "criminal enterprise".

He's gone public about its inner workings — the front-page headlines Pecker would come up with that reporters would have to write stories to match, the photos of Hillary Clinton doctored to make her look terminally ill, and the now infamous "catch and kill" scheme that protected Trump from bad press.

Under the deal Pecker said he made with Trump and Cohen, Pecker would "catch" negative stories by buying the exclusive rights, and "kill" them by making sure they never got to print.

A key player in the scheme, according to Pecker's testimony and other evidence (as well as Cartwright's whistleblower accounts), was another Australian editor — Dylan Howard.

Dylan Howard stands next to a gate and holds a folder while speaking to camera. There's a Channel Seven logo.
Dylan Howard reporting on drug use by AFL players, as revealed by private medical records that were bought by Channel Seven, in 2008.(ABC News)

The former Channel Seven reporter was no stranger to controversy — he parted ways with Seven in 2008, shortly after reporting on unnamed AFL players' stolen private medical records.

The records, which revealed drug use, were said to have been found in a gutter by a member of the public, who sold them to Seven.

Victoria Police investigated, and two people pleaded guilty to "theft by finding". Howard was not charged.

Secret payments

Many of the "catch-and-kill" practices at the National Enquirer have been public knowledge for years, and they were most extensively detailed in journalist Ronan Farrow's 2019 book, Catch and Kill: Lies, Spies, and a Conspiracy to Protect Predators.

Howard criticised the book — which also detailed his work helping filmmaker Harvey Weinstein cover up stories — as "false and defamatory", and threatened Farrow and the book's publisher with legal action.

"I don't know what Ronan Farrow's smoking," Howard told a podcast after the book's release.

"I am not aware of any story about the president that has not been published," he added.

But Pecker, who was Howard's boss at the Enquirer, said Howard played a key role in buying former Playboy playmate Karen McDougal's story about an alleged months-long affair with Trump.

Howard spoke to McDougal and assessed her claims to be true before Pecker agreed to pay her $US150,000 for the story, and bury it. (Trump says the story is false.)

Dylan Howard stands in a suit and glasses in an office.
Dylan Howard was editor-in-chief of the National Enquirer.(Reuters: Lucas Jackson)

Pecker also said it was Howard who called him on a Saturday night in October 2016 and told him porn star Stormy Daniels was shopping her story about an alleged sexual encounter with Trump (which he denies).

"Woman wants 120k. Has offers from Mail and GMA [Good Morning America]," Howard said in a message to Pecker the next day. "I know the denials were made in the past – but this story is true."

This time, Pecker was reluctant to pay.

"I said we already paid $30,000 to the doorman, we already paid $150,000 to Karen McDougal," Pecker told the court. "I am not a bank."

Pecker instead advised Cohen to pay Daniels for the story and "take it off the market", which he ultimately did.

Court sketch of David Pecker on the stand in court.
David Pecker was on the stand for most of the week.(Reuters: Jane Rosenberg)

Howard later said in a text message, according to prosecutors: "At least if he wins, I'll be pardoned for electoral fraud."

Howard has returned to Australia and is unlikely to give evidence in the trial. The court has been told he has a spinal condition and cannot travel overseas. His lawyer, John Harris, said New York court rules meant witnesses in the case could not give evidence remotely.

Mr Harris told the ABC: "Dylan Howard has always fully cooperated with government inquiries regarding his former employer's relationship with Donald Trump, and the actions he was directed to do. But for Mr Howard’s inability to travel, he would have again, voluntarily, answered questions."

'We would embellish a little'

This week's evidence included more stunning claims about the control Trump's lawyer had over the Enquirer's content.

Pecker told the court Cohen would call him and request a negative article on a political rival. "He would send me information about Ted Cruz or about Ben Carson or Marco Rubio, and that was the basis of our story, and then we would embellish it a little," Pecker said.

He often provided Cohen with drafts of stories, so he could provide feedback.

The defence argues any dealings between Trump, Cohen and Pecker were nothing sinister. Questioned by Trump's lawyer Emil Bove on Friday, Pecker agreed the term "catch and kill" was not used during their 2015 meeting, nor was any "financial dimension" discussed.

A drawing of Donald Trump seated next to his lawyer against a red-brown background.
Donald Trump is on trial for falsifying business records.(Reuters: Jane Rosenberg)

Beyond the stories it "killed", there's no way of measuring how helpful the Enquirer ultimately was to Trump's campaign. Pecker told the court the relationship — which saw Trump give him inside information about The Apprentice and tip him off about events and parties he should attend — was "mutually beneficial".

Put simply, Trump stories boosted sales of the Enquirer, and Trump benefited from the publicity.

These days, the tabloid's readership is a small fraction of the millions it once was.

But Todd Belt, an expert in mass media and public opinion at George Washington University, says that's not necessarily the measure of its influence.

"As the National Enquirer has become less important as a publication, it still plays an important role in terms of what we call 'pack journalism' here in the United States," he said.

"It sets an agenda – it puts certain people front and centre in the public discourse, and then other publications will run after the same story."

Much of this evidence is secondary to the central felony allegations. The prosecution is trying to make the case that Trump not only paid hush money, but covered it up in a way that effectively amounts to election fraud.

Crucial to their case is the payment Cohen made to Stormy Daniels after the Enquirer refused to, and Trump's knowledge and intentions relating to that payment. Trump's lawyers have argued it was personal and unrelated to his election campaign, but prosecutors argue it was campaign expenditure that shouldn't have been covered up.

Trial continues

Unless something unexpected happens, Trump will spend another month or more attending court.

All heads turn when he enters and exits the courtroom.

For a man of his age, he appears in the flesh imposing and strong, almost menacing, as he slowly makes his way to and from the defence bench.

Pecker's testimony takes us back to a time when he ruled in this town – a reality TV star, a tycoon who lived in a Midtown high-rise named after him.

The former publisher said he discussed with Trump the idea of him running for president.

A National Enquirer poll found 80 per cent of readers backed the idea of a Trump run.

Trump, he said, cited the poll when asked soon after about his intentions.

Was the tabloid king egging on the reality TV star in the hope of further boosting ratings?

Interest in his then-friend, he said, "skyrocketed" after he announced his campaign.

Trump has long been estranged from the city where he made his name and built his fortune. 

As he sits day after day in a bleak Manhattan courtroom, I wonder if he ever wishes the results of that tabloid poll had come back differently.

Additional reporting: Brad Ryan