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Is space-based solar power a costly, risky pipe dream? Or is it a viable way to combat climate change? Although beaming solar power from space to Earth could ultimately involve transmitting gigawatts, the process could be made surprisingly safe and cost-effective, according to experts from Space Solar, the European Space Agency, and the University of Glasgow.

But we’re going to need to move well beyond demonstration hardware and solve a number of engineering challenges if we want to develop that potential.

Designing space-based solar

Beaming solar energy from space is not new; telecommunications satellites have been sending microwave signals generated by solar power back to Earth since the 1960s. But sending useful amounts of power is a different matter entirely.

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In the early 2000s, local fossil collector Mohamed ‘Ou Said’ Ben Moula discovered numerous fossils at Fezouata Shale, a site in Morocco known for its well-preserved fossils from the Early Ordovician period, roughly 480 million years ago. Recently, a team of researchers at the University of Lausanne (UNIL) studied 100 of these fossils and identified one of them as the earliest ancestor of modern-day chelicerates, a group that includes spiders, scorpions, and horseshoe crabs.

The fossil preserves the species Setapedites abundantis, a tiny animal that crawled and swam near the bottom of a 100–200-meter-deep ocean near the South Pole 478 million years ago. It was 5 to 10 millimeters long and fed on organic matter in the seafloor sediments. “Fossils of what is now known as S. abundantis have been found early on—one specimen mentioned in the 2010 paper that recognized the importance of this biota. However, this creature wasn’t studied in detail before simply because scientists focused on other taxa first,” Pierre Gueriau, one of the researchers and a junior lecturer at UNIL, told Ars Technica.

The study from Gueriau and his team is the first to describe S. abundantis and its connection to modern-day chelicerates (also called euchelicerates). It holds great significance, because “the origin of chelicerates has been one of the most tangled knots in the arthropod tree of life, as there has been a lack of fossils between 503 to 430 million years ago,” Gueriau added.

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Advances in artificial intelligence are making it increasingly difficult to distinguish between uniquely human behaviors and those that can be replicated by machines. Should artificial general intelligence (AGI) arrive in full force—artificial intelligence that surpasses human intelligence—the boundary between human and computer capabilities will diminish entirely.

In recent months, a significant swath of journalistic bandwidth has been devoted to this potentially dystopian topic. If AGI machines develop the ability to consciously experience life, the moral and legal considerations we’ll need to give them will rapidly become unwieldy. They will have feelings to consider, thoughts to share, intrinsic desires, and perhaps fundamental rights as newly minted beings. On the other hand, if AI does not develop consciousness—and instead simply the capacity to out-think us in every conceivable situation—we might find ourselves subservient to a vastly superior yet sociopathic entity.

Neither potential future feels all that cozy, and both require an answer to exceptionally mind-bending questions: What exactly is consciousness? And will it remain a biological trait, or could it ultimately be shared by the AGI devices we’ve created?

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Enlarge / No, we haven't photoshopped the rear wheel of this electric motorcycle; it uses a hubless motor. (credit: Michael Teo Van Runkle)

Despite the fact that Americans buy more electric bicycles than electric cars, widespread adoption of electric motorcycles still lags well behind both. Part of the sluggish sales pace likely comes down to high prices, but as tech continues to evolve, e-moto sticker shock will eventually subside.

Lower prices will only enhance the obvious benefits of electrifying motorbikes: silent operation, quick and easy charging, fewer moving parts to service, and a smaller footprint while commuting. In the meantime, one of the most interesting concepts on the market today comes courtesy of a company called Verge, in Finland, with an utterly baffling hubless rear-wheel motor design.

As usual with bleeding-edge tech, Verge's first model, the TS, commands a serious premium: a base TS starts at $26,900, and the mid-level TS Pro adds $3,000 to that, while the TS Ultra ramps all the way up to $49,900. I recently test-rode an early TS Pro that Verge shipped to the United States, hoping to prove whether this hubless rear motor truly deserves a future in the industry or simply represents another over-priced gimmick.

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Enlarge / Tires are a growing source of microplastic pollution. Michelin says it wants to change that. (credit: Getty Images)

Reduce, Reuse, Recycle—it's more than just a fun alliteration tagline. It's also a set of instructions for how to consume in a way that's less destructive to our environment. We reduce our consumption and reuse what we already have, then recycle it once it no longer has any use. Unfortunately, many are going straight to recycling and calling it a day.

At its sustainability summit in Northern California at the Sonoma Raceway, Michelin laid out a new roadmap for its plans to become a more sustainable company. Most importantly, the company shared what it's been doing for decades to reduce the harm done to the world by its tires.

The company reiterated its desire to have 100 percent renewable tires by 2050. Companies make a lot of pronouncements like this, and they only sometimes come to fruition. But looking at Michelin's present efforts and past record, the company has a decent chance of succeeding.

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Enlarge / Some of the waste material that ends up part of these bricks. (credit: Seamus Daniel, RMIT University)

Researchers at the Royal Melbourne Institute of Technology (RMIT) in Australia have developed special “energy-smart bricks” that can be made by mixing clay with glass waste and coal ash. These bricks can help mitigate the negative effects of traditional brick manufacturing, an energy-intensive process that requires large-scale clay mining, contributes heavily to CO₂ emissions, and generates a lot of air pollution.

According to the RMIT researchers, “Brick kilns worldwide consume 375 million tonnes (~340 million metric tons) of coal in combustion annually, which is equivalent to 675 million tonnes of CO₂ emission (~612 million metric tons).” This exceeds the combined annual carbon dioxide emissions of 130 million passenger vehicles in the US.

The energy-smart bricks rely on a material called RCF waste. It mostly contains fine pieces of glass (92 percent) left over from the recycling process, along with ceramic materials, plastic, paper, and ash. Most of this waste material generally ends up in landfills, where it can cause soil and water degradation. However, the study authors note, “The utilization of RCF waste in fired-clay bricks offers a potential solution to the increasing global waste crisis and reduces the burden on landfills."

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Enlarge / The Tourbillon is recognizable as a modern Bugatti, but it's very different under the skin. (credit: Bradley Iger)

Since the launch of the hypercar-defining Veyron back in 2005, modern Bugattis have served as benchmarks for straight-line performance and no-expense-spared automotive engineering. At a time when a 300 horsepower Mustang GT was something to crow about, the quad-turbocharged, W16-powered Veyron offered more than a thousand, metric (987 hp/736 kW).

Perhaps more importantly, and in contrast to most other world-beating performance cars, the Veyron wasn't presented as some skunkworks project that had been pushed to the ragged edge. Instead, it was a wholly realized ultra-luxury performance machine, replete with the sort of grand touring appointments you'd expect to find in a Bentley rather than a top-speed record holder.

Still, it was the numbers that instantly captivated enthusiasts and casual onlookers alike, and Bugatti would go on to reset the bar with the introduction of the 1,479 hp (1,102 kW) Chiron in 2016.

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Enlarge / Zork running on an Amiga at the Computerspielemuseum in Berlin, Germany. (credit: Marcin Wichary (CC by 2.0 Deed))

You are standing at the end of a road before a small brick building.

That simple sentence first appeared on a PDP-10 mainframe in the 1970s, and the words marked the beginning of what we now know as interactive fiction.

From the bare-bones text adventures of the 1980s to the heartfelt hypertext works of Twine creators, interactive fiction is an art form that continues to inspire a loyal audience. The community for interactive fiction, or IF, attracts readers and players alongside developers and creators. It champions an open source ethos and a punk-like individuality.

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Enlarge / NASA's James Webb Space Telescope reveals the Rho Ophiuchi cloud complex, the closest star-forming region to Earth.

In a feat of galactic archeology, astronomers are using ever more detailed information to trace the origin of our galaxy—and to learn about how other galaxies formed in the early stages of the Universe. Using powerful space telescopes like Gaia and James Webb, astronomers are able to peer back in time and look at some of the oldest stars and galaxies. Between Gaia’s data on the position and movements of stars within our Milky Way and Webb’s observations of early galaxies that formed when the Universe was still young, astronomers are learning how galaxies come together and have made surprising discoveries that suggest the early Universe was busier and brighter than anyone previously imagined.

The Milky Way’s earliest pieces

In a recent paper, researchers using the Gaia space telescope identified two streams of stars, named Shakti and Shiva, each of which contains a total mass of around 10 million Suns and which are thought to have merged into the Milky Way around 12 billion years ago.

These streams were present even before the Milky Way had features like a disk or its spiral arms, and researchers think they could be some of the earliest building blocks of the galaxy as it developed.

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Enlarge / The R1S and R1T don't look much different from the electric trucks we drove in 2022, but under the skin, there have been a lot of changes. (credit: Rivian)

In rainy Seattle this week, Rivian unveiled what it's calling the "Second Generation" of its R1 line with a suite of mostly under-the-hood software and hardware updates that increase range, power, and efficiency while simultaneously lowering the cost of production for the company. While it's common for automotive manufacturers to do some light refreshes after about four model years, Rivian has almost completely retooled the underpinnings of its popular R1S SUV and R1T pickup just two years after the vehicles made their debut.

"Overdelivering on the product is one of our core values," Wassym Bensaid, the chief software officer at Rivian, told a select group of journalists at the event on Monday night, "and customer feedback has been one of the key inspirations for us."

For these updates, Rivian changed more than half the hardware components in the R1 platform, retooled its drive units to offer new tri- and quad-motor options (with more horsepower), updated the suspension tuning, deleted 1.6 miles (2.6 km) of wiring, reduced the number of ECUs, increased the number of cameras and sensors around the vehicle, changed the battery packs, and added some visual options that better aligned with customizations that owners were making to their vehicles, among other things. Rivian is also leaning harder into AI and ML tools with the aim of bringing limited hands-free driver-assistance systems to their owners toward the end of the year.

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We’ve been living through the generative AI boom for nearly a year and a half now, following the late 2022 release of OpenAI’s ChatGPT. But despite transformative effects on companies’ share prices, generative AI tools powered by large language models (LLMs) still have major drawbacks that have kept them from being as useful as many would like them to be. Retrieval augmented generation, or RAG, aims to fix some of those drawbacks.

Perhaps the most prominent drawback of LLMs is their tendency toward confabulation (also called “hallucination”), which is a statistical gap-filling phenomenon AI language models produce when they are tasked with reproducing knowledge that wasn’t present in the training data. They generate plausible-sounding text that can veer toward accuracy when the training data is solid but otherwise may just be completely made up.

Relying on confabulating AI models gets people and companies in trouble, as we’ve covered in the past. In 2023, we saw two instances of lawyers citing legal cases, confabulated by AI, that didn’t exist. We’ve covered claims against OpenAI in which ChatGPT confabulated and accused innocent people of doing terrible things. In February, we wrote about Air Canada’s customer service chatbot inventing a refund policy, and in March, a New York City chatbot was caught confabulating city regulations.

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Enlarge / With just 222 miles of range, you can't venture far off-grid in the Subaru Solterra. (credit: Subaru)

Over the years, Subaru has generated a cult following in the US, making its name with all-wheel drive powertrains and a go-anywhere attitude. Cars like the rally-bred WRXes and STIs did a lot of work here, but lately, Subaru has seemed to go in the opposite direction, phasing out fun drives like the STI lineup in favor of volume-movers like the Ascent and bloated versions of existing models such as the Subaru Wilderness editions.

Its first electric vehicle is perhaps even less in character. The $44,995 Solterra is the result of an ongoing partnership with Toyota and was developed together with the bZ4X. Unlike the Toyota, there's no single-motor option for the Solterra. It's all-wheel-drive only, with a pair of identical 107 hp (80 kW) permanent magnet electric motors, one for each axle. That means you can do some, but not all, of the off-road things you'd expect to do with a Subaru.

Looks are deceiving

At first glance, the Solterra looks like the edgy, tech-leaning offspring of a Crosstrek and an Impreza wagon. The 8.3 inches of ground clearance is slightly less than the Outback or Forester, while the Solterra comes in at 184.6 inches (4,689 mm) in length, placing it squarely in the middle of the brand's stable. It's a rather compact SUV, even more so when you try to get comfortable in the cockpit. My short frame was cramped, and anyone taller than me won't feel welcome on long drives.

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Enlarge / The regular Hyundai Elantra is a perfectly fine compact sedan. But once the boffins at Hyundai N got hold of it, they transformed it into something with a lot more character. (credit: Peter Nelson)

Few cars are aimed quite at driving enthusiasts like the wholesome sport compact. In terms of everyday usability and fun factor, little can touch them, and luckily, there's still a good variety of them on the new market. Among the best is the Hyundai Elantra N, which, for the 2024 model year, received a styling and chassis refresh. Pricing starts at $33,245 for three pedals and a manual gearbox, or $35,515 for a dual-clutch eight-speed, and either is a massive value for the performance and fun factor that they offer.

Amply sporty styling, plenty spacious

The 2024 Elantra N's biggest change is in its face. Where previously it had beady eyes surrounded in a sea of black trim—kind of like the vehicular equivalent of a Belgian Malinois—its headlight, grille, and intake are now more geometric. Looks are subjective, but I'm a fan of the headlights, and the functional inlets improve radiator and brake cooling over the previous fascia.

Elsewhere, it's pretty much the same angular four-door wearing some trapezoidal accents across its body panels and a pronounced rear spoiler. A new set of forged 19-inch wheels is wrapped in 245/35/19 Michelin Pilot Sport 4S tires—these also shave off 8.25 lbs (3.75 kg) of unsprung weight at each corner, which bodes well for acceleration and handling.

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Enlarge / No one's entirely sure if driverless racing will be any good to watch, but before we find that out, people have to actually develop driverless race cars. A2RL in Abu Dhabi is the latest step down that path. (credit: A2RL)

ABU DHABI—We live in a weird time for autonomous vehicles. Ambitions come and go, but genuinely autonomous cars are further off than solid-state vehicle batteries. Part of the problem with developing autonomous cars is that teaching road cars to take risks is unacceptable.

A race track, though, is a decent place to potentially crash a car. You can take risks there, with every brutal crunch becoming a learning exercise. (You’d be hard-pressed to find a top racing driver without a few wrecks smoldering in their junior career records.)

That's why 10,000 people descended on the Yas Marina race track in Abu Dhabi to watch the first four-car driverless race.

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Enlarge / Until the Bolt returns, this is Chevrolet's entry-level electric car, the Equinox EV. (credit: Michael Teo Van Runkle)

A new entry-level EV from General Motors hits the market this year bearing the name Equinox, but other than nomenclature, this Chevy is not at all related to the current internal-combustion compact crossover. Instead, the new Equinox EV rides on the smallest iteration of GM's Ultium platform until the Bolt reboots with a new (lithium iron phosphate) Ultium battery pack.

The Equinox EV shares its chassis with the forthcoming Cadillac Optiq but aims instead to hit the market as cheaply as possible and significantly undercut Tesla's Model Y. Deliveries will start later this year with the LT trim level, which has a starting MSRP of $34,995. Eager to prove what it no doubt hopes will be the new cash-cow EV's bona fides, Chevrolet invited media to Detroit to drive a fleet of Equinoxes in various trim levels.

On paper, the Equinox's stats look fairly solid. A smallish 85 kWh battery is sufficient for an EPA range estimate of 319 miles (513 km) for the front-wheel-drive base model. Output for the single motor clocks in at a respectable 213 hp (159 kW) and 236 lb-ft (320 Nm) of torque. Perhaps the only downside appears to be a max DC fast-charging rate of 150 kW, though thanks to the battery's overall capacity, the Equinox should still add 77 miles (124 km) of range in about 10 minutes.

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Enlarge / The Mustang Mach-E Rally is the latest version of Ford's electric crossover. It features plenty of power and a new drive mode, as well as plenty of rally-inspired accoutrements. (credit: Tim Stevens)

Mildly off-road-ready performance variants are extremely trendy right now, and it's easy to turn your nose up at them. But when cars like the 911 Dakar or Huracan Sterrato actually improve the day-to-day drivability and comfort of the road-focused machines upon which they're lifted, you have to respect them.

Me? I'm a die-hard rally fan and someone who'd rather drive sideways than straight. It's no surprise that I love these special editions, from their top-boxes down to their all-terrain tires. But I also love electric vehicles, and while there are plenty of electrified crossovers and SUVs out there, it's slim pickings if you want something rally-ready.

Today, that changes.

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Enlarge / The Cadillac Optiq is the brand's next EV, slotting underneath the electric Lyriq in the range. (credit: Michael Teo Van Runkle)

Earlier this month, Cadillac showed off the all-new, all-electric 2025 Optiq to select media in downtown Los Angeles. The Optiq will slot in below the larger Lyriq, Celestiq, and Escalade IQ SUVs but is still based on GM's steadily proliferating Ultium electric vehicle architecture.

Having driven no fewer than five different Ultium-based vehicles in the past year, I visited the Optiq preview, hoping to learn how Cadillac can differentiate this compact crossover from other offerings in an increasingly competitive segment. I also wanted to see whether GM has effectively made the case for EV converts who are looking at entry-level options versus a lower price point for the similarly specced Chevrolet Equinox EV.

In person, the Optiq's exterior styling continues the language established by Lyriq and Celestiq, if toned down to a slightly less-aggressive futuristic level. Straked patterns on the angular, faded quarter panels make for a nice touch, though the details looked two-dimensional, as if they were stickers, until I got up close enough to inspect the use of real glass layering.

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Enlarge / The Sky-Watcher HEQ5 Pro and the Unistellar Odyssey Pro. (credit: Tim Stevens)

It's been 300 years since Galileo and Isaac Newton started fiddling around with lenses and parabolic mirrors to get a better look at the heavens. But if you look at many of the best amateur telescopes today, you'd be forgiven for thinking they haven't progressed much since.

Though components have certainly improved, the basic combination of mirrors and lenses is more or less the same. Even the most advanced "smart" mounts that hold them rely on technology that hasn't progressed in 30 years.

Compared to the radical reinvention that even the humble telephone has received, it's sad that telescope tech has largely been left behind. But that is finally changing. Companies like Unistellar and Vaonis are pioneering a new generation of scopes that throw classic astronomy norms and concepts out the window in favor of a seamless setup and remarkable image quality.

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Enlarge (credit: Aurich Lawson)

European car manufacturers are currently tripping over themselves to figure out how personal transport and "last mile" solutions will look in the years to come. The solutions are always electric, and they're also tiny. What most companies (bar Citroen, Renault, and Fiat) seem to have forgotten is that we've had an answer to this problem all along: the microcar.

The microcar is a singular little thing—its job is to frugally take one person (or maybe two people) where they need to go while taking up as little space as possible. A few have broken their way into the public consciousness—Top Gear made a global megastar of Peel's cars, BMW's Isetta remains a design icon, and the Messerschmitt KR200 is just plain cool—but where did these tiny wonders come from? And do they have a future?

Well, without the microcar's predecessors, we may not have the modern motorcar as we know it. Sort of.

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Enlarge / Chevrolet is starting at the top with the Silverado EV RST First Edition. It's betting that EV truck buyers want a lot of range and towing capability and will pay handsomely for the experience. (credit: Michael Teo Van Runkle)

The latest addition to Chevrolet's growing family of Ultium electric vehicles recently began shipping to dealers in the form of the Silverado EV's early RST First Edition package. Silverado's top spec level now joins the lineup's previous fleet-only WT trim, meaning the general public can now purchase an enormous electric pickup that strongly resembles the Avalanche of 2001 to 2013. But despite any other similarities to the Hummer EV, which shares a related chassis, or ICE trucks of old, the 2024 Silverado aims to change the game for GM's market positioning despite arriving a full 24 months after Ford's F-150 Lightning.

With a large crew cab, a longer truck bed, and angular sail panels, the Silverado EV looks less boxy than GMC's Hummer EV. Aero gains thanks to the smoother design pair with lower rolling-resistance tires, allowing the Silverado to achieve an EPA range estimate of up to 450 miles (724 km), though the RST First Edition I recently drove over the course of a long day in Michigan earns a rating of 440 miles (708 km).

On the highway, judging by wind noise around the cabin alone, the aerodynamic gains of the Silverado's styling seem to make a noticeable difference versus the Hummer. On the other hand, tire hum might cover up any aero deficiencies because the RST's single weirdest detail constantly occupies center stage here: a set of 24-inch wheels, the largest ever equipped to a car, truck, or SUV straight from the factory.

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