Elon Musk's Starlink internet-from-space satellites leave astronomers 'frustrated' - Euronews | Canada News Media
Connect with us

Science

Elon Musk's Starlink internet-from-space satellites leave astronomers 'frustrated' – Euronews

Published

 on


A total of 420 of Elon Musk’s Starlink satellites are now in low Earth orbit, promising new internet-from-space services, but leaving many astronomers aghast.

Cast your eyes up to the night sky in these pollution-free times here in Europe and you may very well see a train of satellites cruising across the stars.

They are visible without any special equipment, a distinct succession of lights against the blackness. These objects are the beginnings of the Starlink constellation, a privately-owned venture from Elon Musk’s SpaceX company promising to offer high-quality internet connections from space.

The latest launch, on 22nd April, saw 60 satellites placed into orbit by a Falcon 9 rocket, bringing the total aloft to 420, enough to start the roll-out of basic services. It’s not entirely clear how many Starlink satellites will be launched, although it could rise to above 12,000 – enough for astronomers to see red.

Self destruct button?

German amateur astrophotographer Marcel Nowaczyk told Euronews: “From my point of view it is frustrating when you have to delete 25 per cent of your pictures during an imaging session. I’m a bit afraid of our future view of the night sky when there are 10,000 of them in orbit.”

Nowaczyk tweeted that he wished the satellites had some kind of ‘self-destruction inside’. Long-exposure photographs are the bread and butter of astrophotographers, and Starlink tends to leave large white lines right across their pictures. Some are enjoying the spectacle, others are not.

‘Brighter than every star in the sky’

Professor Mark McCaughrean, Senior Advisor for Science and Exploration at the European Space Agency (ESA) told Euronews: “I have to admit that personally, they make me nauseous. They just keep coming for many minutes, endlessly crossing the sky, drawing the eye’s attention, and occasionally flaring brighter than every star in the sky to boot.”

Starlink needs so many satellites because the system hands over connectivity between the spacecraft as they fly overhead, meaning faster speeds for customers on the ground.

The first phase will see around 1,600 satellites flying at 550 kilometres in altitude. Compare that to the far less numerous geostationary satellites delivering television signals to Earth from a point 36,000 kilometres away – certainly not something you’ll easily spot with your binoculars at night.

Musk’s firm isn’t alone in this emerging market, either. A similar plan from fellow tech billionaire Jeff Bezos involves over 3,200 internet-from-space satellites under the name Project Kuiper.

SpaceX is aware of the astronomers’ concerns and says it’s addressing them with anti-reflective surfaces on newer satellites – in short, it will paint them black – and what’s described as a ‘sunshade’ to reduce the reflection from satellites in the future.

Astronomer Jonathan McDowell from the Centre for Astrophysics (Harvard & Smithsonian) said he was “concerned about the potential that large numbers of bright satellites could both ruin professional observations and affect the look of the night sky”.

However he told us he was “encouraged by the measures that SpaceX are now taking to reduce that impact – they have clearly been listening to our concerns”.

Taking away ‘the birthright of all who live on this planet’

Other leading astronomers are taking it more personally, and aren’t afraid to say so.

Euronews reached Carolyn Porco, former imaging team leader on the NASA/ESA Cassini-Huygens mission to Saturn and visiting scholar at University of California at Berkeley,

“These developments and what could follow will ruin the night sky … not just for those engaged in the scientific study of the cosmos but for those of us who find in its glory solace, perspective, and the meaning of one’s life.

It is the only sight to gaze upon that is 13.8 billion years old. You rob us of that, you’ve taken away the birthright of all who live on this planet,” she wrote.

The risk of in-orbit collision

Longer-term the reflectivity issue that now makes Starlink so easy to spot may be partially overcome, but experts including Porco are still concerned about the risk of collision posed by a massive privately-run constellation in such a crowded orbital zone.

The ‘final frontier’ of space isn’t so empty these days, at least near Earth, with about 1,500 active satellites, 2,200 defunct satellites and, according to ESA, millions of tiny fragments of space debris in orbit.

Adding tens of thousands of new satellites to crowded orbital pathways is considered a serious future hazard, especially given that the space sector is largely self-regulating, and some pieces of space junk have just been abandoned to spin out of control.

Porco said there are “insufficient plans for what to do in the event of a collision, or in the event that one of the owners goes bankrupt and can no longer direct his many assets.”

It’s a concern shared by Dutch space debris expert Dr Marco Langbroek, who messaged to say that he is concerned about space safety as future Starlink launches loom.

“The sight of those passing in file over a ~20-minute timespan, 5-8 of them visible at the same time, almost looks like Science Fiction: the Mothership unloading the invasion fleet,” he joked.

Let’s block ads! (Why?)



Source link

Continue Reading

News

Here’s how Helene and other storms dumped a whopping 40 trillion gallons of rain on the South

Published

 on

 

More than 40 trillion gallons of rain drenched the Southeast United States in the last week from Hurricane Helene and a run-of-the-mill rainstorm that sloshed in ahead of it — an unheard of amount of water that has stunned experts.

That’s enough to fill the Dallas Cowboys’ stadium 51,000 times, or Lake Tahoe just once. If it was concentrated just on the state of North Carolina that much water would be 3.5 feet deep (more than 1 meter). It’s enough to fill more than 60 million Olympic-size swimming pools.

“That’s an astronomical amount of precipitation,” said Ed Clark, head of the National Oceanic and Atmospheric Administration’s National Water Center in Tuscaloosa, Alabama. “I have not seen something in my 25 years of working at the weather service that is this geographically large of an extent and the sheer volume of water that fell from the sky.”

The flood damage from the rain is apocalyptic, meteorologists said. More than 100 people are dead, according to officials.

Private meteorologist Ryan Maue, a former NOAA chief scientist, calculated the amount of rain, using precipitation measurements made in 2.5-mile-by-2.5 mile grids as measured by satellites and ground observations. He came up with 40 trillion gallons through Sunday for the eastern United States, with 20 trillion gallons of that hitting just Georgia, Tennessee, the Carolinas and Florida from Hurricane Helene.

Clark did the calculations independently and said the 40 trillion gallon figure (151 trillion liters) is about right and, if anything, conservative. Maue said maybe 1 to 2 trillion more gallons of rain had fallen, much if it in Virginia, since his calculations.

Clark, who spends much of his work on issues of shrinking western water supplies, said to put the amount of rain in perspective, it’s more than twice the combined amount of water stored by two key Colorado River basin reservoirs: Lake Powell and Lake Mead.

Several meteorologists said this was a combination of two, maybe three storm systems. Before Helene struck, rain had fallen heavily for days because a low pressure system had “cut off” from the jet stream — which moves weather systems along west to east — and stalled over the Southeast. That funneled plenty of warm water from the Gulf of Mexico. And a storm that fell just short of named status parked along North Carolina’s Atlantic coast, dumping as much as 20 inches of rain, said North Carolina state climatologist Kathie Dello.

Then add Helene, one of the largest storms in the last couple decades and one that held plenty of rain because it was young and moved fast before it hit the Appalachians, said University of Albany hurricane expert Kristen Corbosiero.

“It was not just a perfect storm, but it was a combination of multiple storms that that led to the enormous amount of rain,” Maue said. “That collected at high elevation, we’re talking 3,000 to 6000 feet. And when you drop trillions of gallons on a mountain, that has to go down.”

The fact that these storms hit the mountains made everything worse, and not just because of runoff. The interaction between the mountains and the storm systems wrings more moisture out of the air, Clark, Maue and Corbosiero said.

North Carolina weather officials said their top measurement total was 31.33 inches in the tiny town of Busick. Mount Mitchell also got more than 2 feet of rainfall.

Before 2017’s Hurricane Harvey, “I said to our colleagues, you know, I never thought in my career that we would measure rainfall in feet,” Clark said. “And after Harvey, Florence, the more isolated events in eastern Kentucky, portions of South Dakota. We’re seeing events year in and year out where we are measuring rainfall in feet.”

Storms are getting wetter as the climate change s, said Corbosiero and Dello. A basic law of physics says the air holds nearly 4% more moisture for every degree Fahrenheit warmer (7% for every degree Celsius) and the world has warmed more than 2 degrees (1.2 degrees Celsius) since pre-industrial times.

Corbosiero said meteorologists are vigorously debating how much of Helene is due to worsening climate change and how much is random.

For Dello, the “fingerprints of climate change” were clear.

“We’ve seen tropical storm impacts in western North Carolina. But these storms are wetter and these storms are warmer. And there would have been a time when a tropical storm would have been heading toward North Carolina and would have caused some rain and some damage, but not apocalyptic destruction. ”

___

Follow AP’s climate coverage at https://apnews.com/hub/climate

___

Follow Seth Borenstein on Twitter at @borenbears

___

Associated Press climate and environmental coverage receives support from several private foundations. See more about AP’s climate initiative here. The AP is solely responsible for all content.

Source link

Continue Reading

Science

‘Big Sam’: Paleontologists unearth giant skull of Pachyrhinosaurus in Alberta

Published

 on

 

It’s a dinosaur that roamed Alberta’s badlands more than 70 million years ago, sporting a big, bumpy, bony head the size of a baby elephant.

On Wednesday, paleontologists near Grande Prairie pulled its 272-kilogram skull from the ground.

They call it “Big Sam.”

The adult Pachyrhinosaurus is the second plant-eating dinosaur to be unearthed from a dense bonebed belonging to a herd that died together on the edge of a valley that now sits 450 kilometres northwest of Edmonton.

It didn’t die alone.

“We have hundreds of juvenile bones in the bonebed, so we know that there are many babies and some adults among all of the big adults,” Emily Bamforth, a paleontologist with the nearby Philip J. Currie Dinosaur Museum, said in an interview on the way to the dig site.

She described the horned Pachyrhinosaurus as “the smaller, older cousin of the triceratops.”

“This species of dinosaur is endemic to the Grand Prairie area, so it’s found here and nowhere else in the world. They are … kind of about the size of an Indian elephant and a rhino,” she added.

The head alone, she said, is about the size of a baby elephant.

The discovery was a long time coming.

The bonebed was first discovered by a high school teacher out for a walk about 50 years ago. It took the teacher a decade to get anyone from southern Alberta to come to take a look.

“At the time, sort of in the ’70s and ’80s, paleontology in northern Alberta was virtually unknown,” said Bamforth.

When paleontogists eventually got to the site, Bamforth said, they learned “it’s actually one of the densest dinosaur bonebeds in North America.”

“It contains about 100 to 300 bones per square metre,” she said.

Paleontologists have been at the site sporadically ever since, combing through bones belonging to turtles, dinosaurs and lizards. Sixteen years ago, they discovered a large skull of an approximately 30-year-old Pachyrhinosaurus, which is now at the museum.

About a year ago, they found the second adult: Big Sam.

Bamforth said both dinosaurs are believed to have been the elders in the herd.

“Their distinguishing feature is that, instead of having a horn on their nose like a triceratops, they had this big, bony bump called a boss. And they have big, bony bumps over their eyes as well,” she said.

“It makes them look a little strange. It’s the one dinosaur that if you find it, it’s the only possible thing it can be.”

The genders of the two adults are unknown.

Bamforth said the extraction was difficult because Big Sam was intertwined in a cluster of about 300 other bones.

The skull was found upside down, “as if the animal was lying on its back,” but was well preserved, she said.

She said the excavation process involved putting plaster on the skull and wooden planks around if for stability. From there, it was lifted out — very carefully — with a crane, and was to be shipped on a trolley to the museum for study.

“I have extracted skulls in the past. This is probably the biggest one I’ve ever done though,” said Bamforth.

“It’s pretty exciting.”

This report by The Canadian Press was first published Sept. 25, 2024.

The Canadian Press. All rights reserved.

Source link

Continue Reading

News

The ancient jar smashed by a 4-year-old is back on display at an Israeli museum after repair

Published

 on

 

TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.

Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.

Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.

The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.

The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.

It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.

Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.

Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.

Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.

Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.

Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.

The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”

The Canadian Press. All rights reserved.

Source link

Continue Reading

Trending

Exit mobile version