Technologies

Dazzling Milky Way panorama reveals nearly 1,000 mysterious galactic threads

An astrophysicist behind the beauty compares the image with modern art.

In the early 1980s, scientists imaged the center of our galaxy 25,000 light-years from Earth. To their surprise, they stumbled upon a cluster of «strands» 150 light-years long hanging out in an oddly organized pattern. For years, they scrutinized the stringy forces, trying to understand what they are and why they’re there.

No, these galactic noodles (probably) aren’t the work of aliens. But they later revealed themselves to be some sort of magnetic wiring, catching space-borne cosmic ray electrons and forcing the particles to gyrate around their fields at nearly the speed of light. If anything, the enigma escalated.

Fast-forward to today. The same researcher who led the first imaging endeavor decided to create an updated version. In a paper published online Wednesday and accepted to The Astrophysical Journal Letters, he presents his results: an absolutely spectacular panorama of radio emission data stemming from the Milky Way’s center.

Cosmic phenomena such as star bursts, stellar nurseries and supernova graveyards stained the picture with brilliant streaks, but most strikingly, the image unveiled 10 times more perplexing strands than before. «It’s like modern art,» Farhad Yusef-Zadeh, an astrophysicist at Northwestern University and lead author of the paper, said in a statement. «These images are so beautiful and rich, and the mystery of it all makes it even more interesting.»

He calls the newer picture a «watershed in furthering our understanding of these structures,» because the initial, relatively sparser collection of filaments was too small to draw any real conclusions about their origin and purpose.

Photographing a massive galaxy

It took three years of surveying the sky and 200 hours using the Meerkat telescope at the South African Radio Astronomy Observatory for Yusef-Zadeh’s team to generate precise observations of 20 separate sections.

Then, the researchers pieced the cutouts together and isolated the magnetic filaments by removing the background. That led to the mesmerizing mosaic photograph that resembles a Jackson Pollock.

«I’ve spent a lot of time looking at this image in the process of working on it, and I never get tired of it,» Ian Heywood, an astrophysicist at Oxford University and study co-author, said in a statement. «When I show this image to people who might be new to radio astronomy, or otherwise unfamiliar with it, I always try to emphasize that radio imaging hasn’t always been this way, and what a leap forward Meerkat really is in terms of its capabilities.»

Leads on the filaments

Now blessed with an ocean of inexplicable Milky Way filaments to analyze, Yusef-Zadeh and team are carrying out a sort of population analysis to understand what the cosmic spaghetti strands have in common, and where they differ.

«If you were from another planet, for example, and you encountered one very tall person on Earth, you might assume all people are tall. But if you do statistics across a population of people, you can find the average height,» he said. «That’s exactly what we’re doing. We can find the strength of magnetic fields, their lengths, their orientations and the spectrum of radiation.»

So far, the team concludes the strands’ magnetic fields are amplified as you travel across them and exhibit variation in their radio emissions. Due to the latter, they say the pieces could’ve originated from a black hole that once lurked in the center of our galaxy or a giant radio-emitting bubble, like one discovered in 2019.

Still, huge question marks remain, such as why are these filaments so structured? And why are there so many? Perhaps the biggest confusion lies within the fact that particles on the strands’ field are moving at nearly the speed of light. Any faster, and they’d fit a time-travel requirement.

«How do you accelerate electrons at close to the speed of light?» Yusef-Zadeh wonders. «One idea is there are some sources at the end of these filaments that are accelerating these particles.»

Going forward, the team says they’ll continue searching for answers.

«We’re certainly one step closer to a fuller understanding,» Yusef-Zadeh said. «But science is a series of progress on different levels. We’re hoping to get to the bottom of it, but more observations and theoretical analyses are needed. A full understanding of complex objects takes time.»

Technologies

iOS 17 Cheat Sheet: Your Questions on the iPhone Update Answered

Here’s what you need to know about new features and upcoming updates for your iPhone.

Apple’s iOS 17 was released in September, shortly after the company held its Wonderlust event, where the tech giant announced the new iPhone 15 lineup, the Apple Watch Series 9 and the Apple Watch Ultra 2. We put together this cheat sheet to help you learn about and use the new features in iOS 17. It’ll also help you keep track of the subsequent iOS 17 updates.

iOS 17 updates

Using iOS 17

Getting started with iOS 17

Make sure to check back periodically for more iOS 17 tips and how to use new features as Apple releases more updates.

17 Hidden iOS 17 Features You Should Definitely Know About

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Technologies

Get Ready for a Striking Aurora That Could Also Disrupt Radio Communications

Don’t expect the storm to cause a lingering problem, though.

A geomagnetic storm is threatening radio communications Monday night, but that doesn’t mean you should be concerned. In fact, it may be an opportunity to see a colorful aurora in the night sky.

The National Oceanic and Atmospheric Administration has issued a geomagnetic storm watch after witnessing a coronal mass ejection from the sun on Saturday. The watch, which was issued over the weekend and will expire after Monday, said the onset of the storm passing over Earth on Sunday night represented a «moderate» threat to communications. As the storm continues to pass through, it could deliver a «strong» threat on Monday night that could cause radio communications to be temporarily disrupted during the worst of it.

Even so, NOAA said, «the general public should not be concerned.»

A coronal mass ejection occurs when magnetic field and plasma mass are violently expelled from the sun’s corona, or the outermost portion of the sun’s atmosphere. In the vast majority of cases, the ejection occurs with no real threat to Earth. However, in the event the ejection happens in the planet’s direction, a geomagnetic storm occurs, and the Earth’s magnetic field is temporarily affected.

In most cases, geomagnetic storms cause little to no disruption on Earth, with radio communications and satellites affected most often. In extreme cases, a geomagnetic storm can cause significant and potentially life-threatening power outages — a prospect that, luckily, the planet hasn’t faced.

Switching poles

Every 11 years, the sun’s magnetic poles switch, with the north pole and south pole swapping positions. During those cycles, the sun’s activity ramps up as it gets closer to pole-switching time. The height of its activity is called solar maximum, and scientists believe we either may be entering the solar maximum or may be already in it.

During periods of heightened solar activity, sunspots increase on the sun and there’s an increase in coronal mass ejections, among other phenomena. According to NOAA, solar maximum could extend into October of this year before the sun’s activity calms and it works towards its less-active phase, solar minimum.

Even when geomagnetic storms hit Earth and disrupt communications, the effects are usually short-lived. Those most affected, including power grid operators and pilots and air traffic controllers communicating over long distances, have fail-safe technologies and backup communications to ensure operational continuity.

But geomagnetic storms aren’t only about radios. In most cases, they also present unique opportunities to see auroras in the night sky. When the storms hit, the plasma they carry creates a jaw-dropping aurora, illuminating the night sky with brilliant colors. Those auroras can be especially pronounced during the most intense phases of the storm, making for nice stargazing.

If you’re interested in seeing the aurora, you’ll need to be ready. The NOAA said the «brunt of the storm has passed» and even if it lingers into Tuesday, there won’t be much to see after Monday night.

Technologies

Last Total Solar Eclipse for 20 Years Is Coming: How to See and Photograph It

It’s your last chance until 2044.

Get your eclipse glasses ready, Skygazers: the Great American Eclipse is on its way. On April 8, there’ll be a total eclipse over North America, the last one until 2044.

A total solar eclipse happens when the moon passes between the Earth and the sun, blocking the sun and turning an otherwise sunny day to darkness for a short period of time. Depending on the angle at which you’re viewing the eclipse, you may see the sun completely shrouded by the moon (called totality) or some variation of it. The more off-angle you are and the further you are from the path of the eclipse, the less likely you’ll be to see the totality.

The 2024 total solar eclipse will happen on Monday, April 8. The Great American Eclipse will reach the Mexican Pacific coast at 11:07 a.m. PT (2:07 p.m. ET), and then traverse the US in a northeasterly direction from Texas to Maine, and on into easternmost Canada. If you want a good look at it, but don’t live in the path of totality, you shouldn’t wait much longer to book accommodation and travel to a spot on the path.

Or how about booking a seat in the sky? Delta Airlines made headlines for offering a flight that allows you to see the entire path of totality. Its first eclipse flight, from Austin, Texas, to Detroit sold out quickly. But as of Monday, Delta has added a second flight from Dallas to Detroit, which also covers the path of totality. The airline also has five flights that will offer prime eclipse viewing.

Not everyone can get on one of those elusive eclipse-viewing flights. Here’s a look at other options to nab a chance to see this rare sight and what to know about it.

Total solar eclipse path

The eclipse will cross over the Pacific coast of Mexico and head northeast over mainland Mexico. The eclipse will then make its way over San Antonio at approximately 2:30 p.m. ET on April 8 and move through Texas, over the southeastern part of Oklahoma and northern Arkansas by 2:50 p.m. ET.

By 3 p.m. ET, the eclipse will be over southern Illinois, and just 5 minutes later, will be traveling over Indianapolis. Folks in northwestern Ohio will be treated to the eclipse by 3:15 p.m. ET, and it will then travel over Lake Erie and Buffalo, New York, by 3:20 p.m. ET. Over the next 10 minutes, the eclipse will be seen over northern New York state, then over Vermont. By 3:35 p.m. ET, the eclipse will work its way into Canada and off the Eastern coast of North America.

Best places to watch the Great American Eclipse

When evaluating the best places to watch this year’s total eclipse, you’ll first want to determine where you’ll have the best angle to see the totality. The farther off-angle you are — in other words, the farther north or south of the eclipse’s path — the less of an impact you can expect.

Therefore, if you want to have the best chance of experiencing the eclipse, you’ll want to be in its path. As of this writing, most of the cities in the eclipse’s path have some hotel availability, but recent reports have suggested that rooms are booking up. And as more rooms are booked, prices are going up.

So if you want to be in the eclipse’s path, and need a hotel to do it, move fast. And Delta’s eclipse-viewing flight from Dallas to Detroit has just four seats left at the time of publication.

Eclipse eye safety and photography

As with any solar eclipse, it’s critical you keep eye safety in mind.

During the eclipse, and especially during the periods before and after totality, don’t look directly at the sun without special eye protection. Also, be sure not to look at the sun through a camera (including the camera on your phone), binoculars, a telescope or any other viewing device. This could cause serious eye injury. Sunglasses aren’t enough to protect your eyes from damage.

If you want to view the eclipse, you’ll instead need solar viewing glasses that comply with the ISO 12312-2 safety standard. Anything that doesn’t meet that standard or greater won’t be dark enough to protect your eyes. Want to get them for free? If you’ve got a Warby Parker eyeglasses store nearby, the company is giving away free, ISO-certified solar eclipse glasses at all of its stores from April 1 until the eclipse, while supplies last.

If you don’t have eclipse viewing glasses handy, you can instead use indirect methods for viewing the eclipse, like a pinhole projector.

Read more: A Photographer’s Adventure With the Eclipse

In the event you want to take pictures of the eclipse, attach a certified solar filter to your camera. Doing so will protect your eyes and allow you to take photos while you view the eclipse through your lens.

There’s also a new app to help you both protect your eyes and take better photos of the eclipse on your phone. Solar Snap, designed by a former Hubble Space Telescope astronomer, comes with a Solar Snap camera filter that attaches to the back of an iPhone or Android phone, along with solar eclipse glasses for protecting your eyesight during the event. After you attach the filter to your phone, you can use the free Solar Snap Eclipse app to zoom in on the eclipse, adjust exposure and other camera settings, and ultimately take better shots of the eclipse.

2024 eclipse compared to 2017

The last total solar eclipse occurred in 2017, and many Americans had a great view. Although there are plenty of similarities between the 2017 total solar eclipse and the one coming April 8, there are a handful of differences. Mainly, the 2024 eclipse is going to cover more land and last longer.

The 2017 eclipse started over the northwest US and moved southeast. Additionally, that eclipse’s path was up to 71 miles wide, compared with a maximum width of 122 miles for this year’s eclipse. Perhaps most importantly, the moon completely covered the sun for just 2 minutes, 40 seconds in 2017. This year, maximum totality will last for nearly four-and-a-half minutes.