Mercury flyby tonight: Europe's BepiColombo spacecraft to attempt its 1st swing past the planet - Space.com | Canada News Media
Connect with us

Science

Mercury flyby tonight: Europe's BepiColombo spacecraft to attempt its 1st swing past the planet – Space.com

Published

 on


A spacecraft bound for the planet Mercury will take a first look at the target tonight, when it makes its first-ever flyby of the small rocky world during an incredibly close encounter tonight.

The mission, called BepiColombo, is a joint project of the European Space Agency (ESA) and the Japanese Aerospace Exploration Agency (JAXA). It is only the second mission in history sent to orbit Mercury, the smallest and innermost planet of the solar system

BepiColombo’s flyby tonight (Oct. 1) will bring the spacecraft within just 124 miles (200 kilometers) of the surface of Mercury, the closest the probe will ever get to the planet during its mission. The first images from the encounter are expected to reach Earth early Saturday (Oct. 2) and will be the first close images of Mercury’s scorched surface since the end of NASA’s Messenger orbiter mission in 2015. 

Related: BepiColombo spacecraft documents 1st year in space with selfies

Artist impression of BepiColombo flying by Mercury on Oct. 1, 2021. (Image credit: ESA/ATG medialab)

BepiColombo will make its closest approach to Mercury at 7:34 p.m. EDT (2334 GMT) today (Oct.1), ESA said in a statement. The spacecraft will then continue on its winding trajectory around the sun

This close pass is one of nine gravity-assist flybys, maneuvers that use the gravity of celestial bodies to adjust a spacecraft’s trajectory, that BepiColombo needs to perform before it can enter its target orbit around the planet. This flyby, however, will take the spacecraft even closer to the scorched planet’s surface, than its ultimate scientific orbit of 300 to 930 miles (480 to 1,500 kilometers).

Unfortunately, BepiColombo won’t be able to use all of its instruments during this opportunity as it is still in its transit configuration. The spacecraft consists of two orbiters, ESA’s Mercury Planetary Orbiter (MPO) and JAXA’s Mercury Magnetospheric Orbiter, that will eventually circle the planet separately. The two orbiters are stacked on top of a transfer module, which blocks some of their instruments, including a high-resolution camera. 

Mercury selfie time!

The €650 million ($750 million) BepiColombo mission will be able to make measurements of the environment around the planet and take images with its black and white ‘selfie’ cameras, which provide a 1024 by 1024 pixel resolution (comparable to an early-2000s flip phone.)

Originally designed to monitor the unfolding of the spacecraft’s solar panels after its launch in October 2018, these selfie cameras previously obtained images of Earth and Venus during earlier BepiColombo flybys. During the Earth flyby in April 2020 and the first Venus flyby in October of that year, BepiColombo zipped by the planets at much greater distances of 7,900 miles (12,700 kilometers) and 6,650 miles (10,700 km) respectively. The second Venus flyby in August of this year took BepiColombo as close as 340 miles (550 kilometers) to the planet’s surface. However, due to Venus’ high reflectiveness, the images were overexposed and didn’t reveal any detail.

Key moments during BepiColombo’s first Mercury flyby on 1 October 2021, which will see the spacecraft pass within 200 km of the planet. (Image credit: ESA)

Will we spot Mercury’s mysterious hollows?

BepiColombo project scientists at ESA Johannes Benkhoff told Space.com in an August interview that he expected Mercury to provide a much better photo opportunity than the probe’s past flybys. The spacecraft will be incredibly close to the planet’s surface and Mercury is dark, unlike Venus, so there should not be any overexposure problems.

“We hope that even with our selfie cameras, we may identify some structures on the surface of Mercury,” Benkhoff said. 

The team would be particularly keen to spot the so-called hollows on Mercury, mysterious dents on the planet’s surface first discovered by NASA’s Messenger probe. Not seen on any other planet in the solar system, these hollows might be caused by evaporation of material from inside Mercury, scientists believe, and might be an indication that the moon-sized planet is much more active than previously thought. 

“The interesting thing is that these hollows appear to be fairly recent,” Benkhoff said in an ESA statement. “It appears that there is some volatile material coming up from the outer layer of Mercury and sublimating into the surrounding space, leaving behind these strange features.”

This high-resolution view of Mercury from NASA’s Messenger spacecraft shows hollows — the irregularly shaped, flat-floored depressions — on the southwestern peak ring of the Scarlatti basin. (Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington)

Still four years to go

After tonight’s close pass, it will take four more flybys of Mercury by BepiColombo before the spacecraft is in the correct position to finally enter the planet’s orbit, which is set to happen in 2025. 

Mercury’s orbit is notoriously difficult for a spacecraft to reach. Although Earth is on average ten times closer to Mercury than to Jupiter, missions aiming for orbits around those planets take about the same time. The reason for that is that a mission to Mercury needs to constantly brake against the gravitational pull of the sun. 

The spacecraft could brake using its thrusters, but the amount of fuel it would need would make such a mission technically nearly impossible. The spacecraft therefore follows a much longer route that takes advantage of the gravitational pull of celestial bodies to gradually slow down. 

A mission to Mercury has some extra technical hurdles to overcome. Orbiting at about a third of the sun-Earth distance, Mercury is extremely hot. The two BepiColombo orbiters will have to handle temperatures of nearly 932 degrees Fahrenheit (500 degrees Celsius), which would melt conventional spacecraft solar panels, ESA said in a statement.

BepiColombo’s next flyby at Mercury will take place in June 2023. Four additional flybys at the planet will follow, none as close as the one today. In December 2025, the spacecraft will be finally ready to enter Mercury’s orbit. The two orbiters will then separate and each will start its own scientific investigation. 

Full of mysteries

Related stories:

It will probably be only after the BepiColombo orbiters begin their separate missions in orbit above Mercury that scientists will learn more about the nature of the planet’s surface hollows. By that time, 10 years will have passed since the demise of Messenger, and the teams hope they will be able to compare high-resolution images from both spacecraft and detect changes on the surface. 

“If we prove that these hollows are changing, that would be one of the most fantastic results we could get with BepiColombo,” Benkhoff said in the statement. “The process driving the creation of these hollows is totally unknown. It might be caused by heat or by solar particles bombarding the surface of the planet. It’s something completely new and everyone is looking forward to getting more data.”

But there are other fascinating questions about the small seemingly lifeless planet at the heart of our solar system. In spite of the scorching temperatures, Mercury seems to harbor ice in shaded craters around its poles. It also has a magnetic field, which scientists would not expect it to have due to its small size. Scientists are also puzzled by the planet’s chemical composition, which suggests it may not have formed this close to the sun but may have been thrown there by a violent cosmic collision. Many questions to answer for BepiColombo, and tonight’s flyby is set to provide only the tiniest taster of the science to come. 

Follow Tereza Pultarova on Twitter @TerezaPultarova. Follow us on Twitter @Spacedotcom and on Facebook

Adblock test (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