How to watch tonight's eta Aquariid meteor shower from anywhere - The Weather Network | Canada News Media
Connect with us

Science

How to watch tonight's eta Aquariid meteor shower from anywhere – The Weather Network

Published

 on


In the early morning hours on Wednesday, we have a chance to see bright streaks across the sky, thanks to Halley’s Comet and the eta Aquariid meteor shower.

Comet Halley is probably the most well-known comet in the world. It puts on a spectacular show every time it flies past our planet, but it only does so once every 75 years.

Twice each year, though, we get a reminder from 1P/Halley that it’s only a matter of time before it comes back for another pass. The first such reminder arrives in the first week of May, in the form of bright streaks of light across the night sky.

This is the eta Aquariid meteor shower, which peaks on the night of May 5-6.

The radiant of the eta Aquariid meteor shower, in the hours before dawn, on May 6. Look for a lineup of Jupiter, Saturn and Mars, as well. Credit: Stellarium/Scott Sutherland

It’s at this time of the year when Earth is making its first pass through the trail of dust and ice left behind by 1P/Halley, as it swings through the inner solar system and around the Sun. The peak of the meteor shower, typically seen in the morning hours of May 6, is when we cross the densest part of that stream. The planet makes a second pass through Halley’s debris trail in late October, producing the Orionids meteor shower at that time.

WILL WE SEE IT?

The best time to see the eta Aquariids is in the few hours just before dawn on May 6. The radiant – the point in the sky where the meteors appear to originate from – only rises above the eastern horizon at around 3 a.m., local time.

This year is not ideal for the eta Aquariids, due to how soon dawn arrives after the radiant rises, and due to the presence of a nearly Full Moon in the sky. Fortunately, with the Moon in the southwestern part of the sky as the radiant rises in the east, its bright light will not be directly in a viewer’s eyes. The light it does cast will ‘wash out’ the dimmest meteors from the shower, though.

Sky conditions will also be an important factor. Check your cloud forecast for the early morning, to see if your skies will be clear enough.

If it is cloudy where you are, thus blocking your view of the meteor shower, there are other ways to check it out.

You can see the signal meteoroids make when they plunge into the atmosphere via Meteor Radar or listen to them via the Meteor Echoes Livestream.

Astronomy Live Stream also presents nightly views of the sky over Colorado.

WHAT CAN WE SEE?

The eta Aquariids typically produce around 50 meteors per hour under ideal conditions (clear, dark sky, with the meteor shower radiant directly overhead). Most observers will likely see about half that number, so around 20-25 per hour, under this year’s conditions.

The flash of a meteor is the result of one of those bits of dust or ice from the comet debris trail hitting the top of Earth’s atmosphere.


A primer on meteoroids, meteors and meteorites. Credits: Scott Sutherland/NASA JPL (Asteroids Ida & Dactyl)/NASA Earth Observatory (Blue Marble)

When a typical ‘meteoroid’ hits the top of the atmosphere, it is travelling around a hundred thousand kilometres per hour. It very quickly compresses the air in its path, so much so that the air heats up to glow, white-hot! This glowing is the ‘meteor’ that we see streaking through the air, high above the ground.

All the while, the air is pressing back on the meteoroid, causing it to slow down, and sometimes exerting enough force on the meteoroid to shatter it! Once the meteoroid slows to the point where it can no longer heat the air to the point of glowing, the meteor winks out.

This eta Aquariids meteor shower does not tend to produce bright fireballs, as the Lyrids do. The meteoroids are moving so quickly when they hit our atmosphere, however, that they can produce a phenomenon called persistent trains.

‘PERSISTENT TRAINS’??

Watch below to see a persistent train from the Geminid meteor shower

When a typical cometary meteoroid hits the top of Earth’s atmosphere, it is moving fast enough to produce a meteor flash (as mentioned above). The particles in the eta Aquariid stream, however, hit Earth’s atmosphere travelling at nearly two and a half times faster than average!

Streaking through the air at 240,000 km/h, meteoroids from Comet Halley produce the usual brief meteor flash. They can also result in a bonus. Once the meteor goes out, a glowing trail is left behind, floating in the air, called a persistent train. Some persistent trains last for minutes after the meteor flash, while others remain visible for hours.

Since persistent trains have only rarely been recorded, scientists still aren’t quite sure what causes them. Two basic ideas could explain them, though.

The first is that the meteoroids are travelling fast enough to strip electrons from the air molecules, leaving them in an ionized state. As the air molecules snatch up electrons from their surroundings, they release energy in the form of light. Since this process can take much longer than the original meteor flash, the ‘train’ appears fainter, and it can persist for some time after the meteor flash ends.

The other idea involves what is known as ‘chemiluminescence’. Metals vaporizing off the surface of the fast-moving meteoroids can chemically react with ozone and oxygen in the air, to produce a glow.

One of these explanations may account for these ‘trains’, or both may cover different occurrences, at different times, and even between individual meteors. It will take more sightings of these to explain them fully.

Sources: RASC | Spaceweather

WATCH BELOW: METEORS SPOTTED FROM THE INTERNATIONAL SPACE STATION

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