Skip to main content

Scientists look to the skies to estimate how fast the universe is expanding

This image of the Cherenkov Telescope Array illustrates all three classes of the 99 telescopes planned for the southern hemisphere at ESO’s Paranal Observatory, as viewed from the center of the array. CTAO/M-A. Besel/IAC (G.P. Diaz)/ESO

The Hubble Constant is one of the most important concepts in astronomy. It describes how fast the universe is expanding, which has implications for the age and future development of the universe.

Recommended Videos

Many different figures have been presented for the constant over the years, based on different data analyses. A recent estimate based on data from the Hubble Space Telescope found the constant to be in the region of 74 kilometers per second per megaparsec. That means that for every megaparsec of distance (a megaparsec is approximately 3.26 million light-years) that an object is away from you, its velocity would appear to increase by 74 kilometers per second.

Now, a new paper has used a different technique to estimate the constant and found a slightly slower rate of expansion of 67.5 kilometers per second per megaparsec. To find the constant, the team looked at the interactions between gamma rays, which are a highly energetic form of electromagnetic radiation, and the background light fog of the universe, called the extragalactic background light (EBL). As the gamma rays move through the EBL, they are absorbed and attenuated.

The scientists studied the rate of attenuation to figure out how far the gamma rays had traveled. If they were highly attenuated, they must have traveled further, indicating faster expansion. If they were less attenuated, the expansion must be slower. They collected data using the Fermi Gamma-ray Space Telescope and Imaging Atmospheric Cherenkov Telescopes, like those in the Cherenkov Telescope Array pictured above.

“Cosmology is about understanding the evolution of our universe — how it evolved in the past, what it is doing now and what will happen in the future,” co-author Marco Ajello, an associate professor in the Clemson University department of physics and astronomy, said in a statement. “Our knowledge rests on a number of parameters — including the Hubble Constant — that we strive to measure as precisely as possible. In this paper, our team analyzed data obtained from both orbiting and ground-based telescopes to come up with one of the newest measurements yet of how quickly the universe is expanding.”

The findings are published in the Astrophysical Journal.

Georgina Torbet
Georgina has been the space writer at Digital Trends space writer for six years, covering human space exploration, planetary…
What happened to Amazon’s inaugural Project Kuiper launch?
Official Imagery for Amazon Project Kuiper.

Amazon is aiming to take on SpaceX’s Starlink internet service using thousands of its own Project Kuiper satellites in low-Earth orbit.

The first Project Kuiper satellites were suppsoed to launch aboard a United Launch Alliance (ULA) Atlas V rocket from Cape Canaveral in Florida on April 9, but rough weather conditions forced the mission team to scrub the planned liftoff.

Read more
EVs top gas cars in German reliability report — but one weak spot won’t quit
future electric cars 2021 volkswagen id4 official 32

Electric vehicles are quietly crushing old stereotypes about being delicate or unreliable, and the data now backs it up in a big way. According to Germany’s ADAC — Europe’s largest roadside assistance provider — EVs are actually more reliable than their internal combustion engine (ICE) counterparts. And this isn’t just a small study — it’s based on a staggering 3.6 million breakdowns in 2024 alone.
For cars registered between 2020 and 2022, EVs averaged just 4.2 breakdowns per 1,000 vehicles, while ICE cars saw more than double that, at 10.4 per 1,000. Even with more EVs hitting the road, they only accounted for 1.2% of total breakdowns — a big win for the battery-powered crowd.
Among standout performers, some cars delivered exceptionally low breakdown rates. The Audi A4 clocked in at just 0.4 breakdowns per 1,000 vehicles for 2022 models, with Tesla’s Model 3 right behind at 0.5. The Volkswagen ID.4, another popular EV, also impressed with a rate of 1.0 – as did the Mitsubishi Eclipse Cross at 1.3. On the flip side, there were some major outliers: the Hyundai Ioniq 5 showed a surprisingly high 22.4 breakdowns per 1,000 vehicles for its 2022 models, while the hybrid Toyota RAV4 posted 18.4.
Interestingly, the most common issue for both EVs and ICE vehicles was exactly the same: the humble 12-volt battery. Despite all the futuristic tech in EVs, it’s this old-school component that causes 50% of all EV breakdowns, and 45% for gas-powered cars. Meanwhile, EVs shine in categories like engine management and electrical systems — areas where traditional engines are more complex and failure-prone.
But EVs aren’t completely flawless. They had a slightly higher rate of tire-related issues — 1.3 breakdowns per 1,000 vehicles compared to 0.9 for ICE cars. That could be due to their heavier weight and high torque, which can accelerate tire wear. Still, this trend is fading in newer EVs as tire tech and vehicle calibration improve.
Now, zooming out beyond Germany: a 2024 Consumer Reports study in the U.S. painted a different picture. It found that EVs, especially newer models, had more reliability issues than gas cars, citing tech glitches and inconsistent build quality. But it’s worth noting that the American data focused more on owner-reported problems, not just roadside breakdowns.
So, while the long-term story is still developing, especially for older EVs, Germany’s data suggests that when it comes to simply keeping you on the road, EVs are pulling ahead — quietly, efficiently, and with far fewer breakdowns than you might expect.

Read more
You can now lease a Hyundai EV on Amazon—and snag that $7,500 tax credit
amazon autos hyundai evs lease ioniq 6 n line seoul mobility show 2025 mk08

Amazon has changed how we shop for just about everything—from books to furniture to groceries. Now, it’s transforming the way we lease cars. Through Amazon Autos, you can now lease a brand-new Hyundai entirely online—and even better, you’ll qualify for the full $7,500 federal tax credit if you choose an electric model like the Ioniq 5, Ioniq 6, or Kona EV.
Here’s why that matters: As of January 2025, Hyundai’s EVs no longer qualify for the tax credit if you buy them outright, due to strict federal rules about battery sourcing and final assembly. But when you lease, the vehicle is technically owned by the leasing company (Hyundai Capital), which allows it to be classified as a “commercial vehicle” under U.S. tax law—making it eligible for the credit. That savings is typically passed on to you in the form of lower lease payments.
With Amazon’s new setup, you can browse Hyundai’s EV inventory, secure financing, trade in your current vehicle, and schedule a pickup—all without leaving the Amazon ecosystem.
It’s available in 68 markets across the U.S., and pricing is fully transparent—no hidden fees or haggling. While Hyundai is so far the only automaker fully participating, more are expected to join over time.
Pioneered by the likes of Tesla, purchasing or leasing vehicles online has been a growing trend since the Covid pandemic.
A 2024 study by iVendi found that 74% of car buyers expect to use some form of online process for their next purchase. In fact, 75% said online buying met or exceeded expectations, with convenience and access to information cited as top reasons. The 2024 EY Mobility Consumer Index echoed this trend, reporting that 25% of consumers now plan to buy their next vehicle online—up from 18% in 2021. Even among those who still prefer to finalize the purchase at a dealership, 87% use online tools for research beforehand.
Meanwhile, Deloitte’s 2025 Global Automotive Consumer Study reveals that while 86% of U.S. consumers still want to test-drive a vehicle in person, digital tools are now a critical part of the buying journey.
Bottom line? Amazon is making it easier than ever to lease an EV and claim that tax credit—without the dealership hassle. If you're ready to plug in, it might be time to add to cart.

Read more