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NASA’s Webb Telescope mirror crushes “most optimistic predictions” after final alignment

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4 years ago

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NASA says that the nascent James Webb Space Telescope’s (JWST) “optical performance…continues to be better than the…most optimistic predictions” after completing the alignment of its record-breaking mirror.

Between 7 and 14 years behind schedule and over budget by a factor of 2 to 10, an Arianespace Ariane 5 rocket sent the Webb Telescope on its way to deep space on December 25th, 2021. Weighing 6.2 tons (~13,600 lb), JWST was almost half as heavy at liftoff as NASA’s iconic Hubble Space Telescope despite packing an unprecedented origami-like mirror with more than six times Hubble’s total collecting area. The combination of extreme mass reduction and extraordinary complexity required to launch such a large mirror so far from Earth with a rocket like Ariane 5 helps to partially explain why the Webb Telescope took so long (~18 years) and cost so much (~$9.7 billion) to design, develop, and build.

Nonetheless, launch it finally did. Ariane 5 did most of the work, sending the telescope on a trajectory that – with some help from its onboard thrusters – would guide it to the Sun-Earth L2 Lagrange point located some 1.5 million kilometers (~950,000 miles) from Earth. In perhaps the largest relief in the history of space-based observatories, the Webb Telescope’s immensely complex deployment process was then completed without a single major issue. 30 days after liftoff, the telescope – fully deployed – reached its operational orbit.

For the past four months, in comparison, almost all JWST work has focused on the less visible and far smaller processes of alignment and calibration. Each of JWST’s 18 main mirror segments has slowly but surely inched micrometer by micrometer into position while large swaths of the telescope slowly cooled to ambient temperatures – essential for maximum performance. Simultaneously, all of Webb’s primary instruments have achieved first light and entered the early phases of calibration and commissioning. Only after the instruments are painstakingly calibrated, the mirror is perfectly aligned, and crucial hardware is chilled to temperatures as low as -449°F (-267°C) can Webb begin to observe the universe and revolutionize large subsets of space science.

An inward view of the fruits of alignment. (NASA)

The first and most important step – mirror alignment – is now complete. The alignment process began in February 2022, six weeks after liftoff. First, images were captured with the unaligned mirror to help determine exactly what condition it was in. One by one, each of Webb’s 18 mirror segments were individually moved to determine which image each mirror was responsible for, which then allowed ground controllers to properly focus each mirror’s view of a target star. In a process known as “coarse phasing,” once those 18 points of light well-resolved and linked to a specific mirror segment, the segments were gradually steered on top of each other to produce a single image.

“Coarse” heavily undersells the almost unfathomable precision required to complete the step. To reach its full potential, each of the Webb Telescope’s mirror segments must be aligned to within 50 nanometers of each other. According to NASA, “if the Webb primary mirror were the size of the United States, each segment would be the size of Texas, and the team would need to line the height of those Texas-sized segments up with each other to an accuracy of about 1.5 inches.”

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The product of coarse phasing – beautiful but not yet scientifically useful. (NASA)

Fine phasing followed, involving an even more esoteric set of processes designed to focus the mirror as perfectly as possible. The resulting image was then tweaked to properly align it over the field of view of each of the Webb Telescope’s four main scientific instruments. Finally, some steps of the seven-step alignment process were redone or refined to fully optimize the mirror to the liking of its Earthbound creators and prospective users.

Ultimately, Webb Telescope alignment was extraordinarily successful, producing an image sharper and cleaner than even the “most optimistic predictions” made by its engineers. NASA says that the image is so detailed that it has effectively reached the physical resolution limit for a mirror the size of the Webb Telescope’s, meaning that it would have to violate the known laws of physics to resolve any more detail.

https://twitter.com/AndrasGaspar/status/1520184730985148418
JWST’s first images with a fully aligned mirror. (NASA)

With mirror alignment complete, JWST has just one main hurdle left before science operations can begin: instrument commissioning. Commissioning is a catch-all phrase that covers a wide range of calibration, analysis, experiments, and optimization required to verify that JWST’s four main instruments are behaving as expected and accomplishing the work they were designed to do as accurately and reliably as possible.

At some point, the use of extraordinarily complex scientific instruments becomes more akin to an art form, and some degree of trust must be built up between scientists and their hopeful tools of the trade before they can confidently set chisel to marble and begin delving into the universe at unprecedented breadth and detail. If commissioning proceeds as smoothly as deployment and alignment, the JWST team could be ready to capture and share the telescope’s first actionable observations of the cosmos as early as July 2022.

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Eric Ralph is Teslarati's senior spaceflight reporter and has been covering the industry in some capacity for almost half a decade, largely spurred in 2016 by a trip to Mexico to watch Elon Musk reveal SpaceX's plans for Mars in person. Aside from spreading interest and excitement about spaceflight far and wide, his primary goal is to cover humanity's ongoing efforts to expand beyond Earth to the Moon, Mars, and elsewhere.

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Tesla China rolls out Model Y L V2L adapter, and it’s free for early owners

Tesla China announced the rollout of the Model Y L’s AC external power adapter on social media platforms such as Weibo.

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4 hours ago

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November 10, 2025

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Credit: Tesla China

Tesla China has released a useful new accessory for the Model Y L, and it is free for some owners. With the accessory, the Model Y L effectively becomes a giant power bank that owners can use to power appliances when they are camping, or if their homes are hit by a power outage. 

Tesla Model Y L V2L adapter

Tesla China announced the rollout of the Model Y L’s AC external power adapter on social media platforms such as Weibo. As per the product’s advertisement, the Model Y L could provide up to 2,200W of power with its adapter, allowing it to support numerous appliances on the go. Of course, but could also be used to charge devices during power outages. 

Tesla China notes that the adapter’s current is 220V, and it also features an IP44 protection grade. Tesla notes that the adapter could operate at temperatures between -30℃ ~ +50℃. The Model Y L’s V2L functionality would not work if the vehicle’s battery is less than 10%, however. 

Tesla China’s official shop is selling its AC external power adapter for a reasonable price. The product could be purchased for RMB599, which is equivalent to $85. That’s a great price for an accessory that could make car camping sessions several times more convenient.

Free for early Model Y L owners

While the Model Y L’s AC external power adapter is priced reasonably at the Tesla China shop, the accessory is available for free for early owners of the extended wheelbase six-seat all-electric crossover. This was highlighted in a message that Tesla China reportedly sent to owners of the vehicle.

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“Your Tesla account is eligible for a free Model Y L dedicated AC external power adapter. Please log in to the online store to add the adapter to your cart. Once the system verifies it correctly, the price will automatically change to 0 yuan before placing the order. We will send it to you via express delivery subsequently. 

“This free qualification is only for the first owner of the Model YL who did not receive an AC external power adapter at pickup, valid until February 28, 2026. Failure to place an order upon expiration will be considered as a waiver of eligibility. If there is a temporary shortage of goods, please be patient and we will reschedule the replenishment by the end of January 2026,” Tesla China wrote. 

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Tesla Cybertruck and Model 3 program manager steps down

The now-former executive played a central role in several of Tesla’s key milestones.

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4 hours ago

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November 10, 2025

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Siddhant Awasthi, Tesla’s Program Manager for the Cybertruck and Model 3, has announced his departure after eight years with the company. Starting as an intern, Awasthi played a central role in several of Tesla’s key milestones, from the ramp-up of the Model 3 and Giga Shanghai to the launch of the long-awaited Cybertruck.

From intern to program leader

In a social media post, Awasthi described leaving Tesla as “one of the hardest decisions” of his life. He credited CEO Elon Musk, Tesla’s leadership team, and his colleagues for helping turn ambitious ideas into tangible vehicles. During his tenure, Awasthi contributed to Tesla’s global expansion and the evolution of its vehicle electronics and wireless systems, culminating in the Cybertruck’s long-anticipated rollout in late 2023.

He noted the intensity and innovation of his Tesla years, calling the experience “a thrilling journey” that shaped his career before the age of 30. “It’s been an absolute privilege,” he wrote, adding that working with “rockstar colleagues” made even the most demanding days worthwhile.

Tesla’s leadership transitions

Awasthi’s departure comes as Tesla continues to scale global operations and prepare for major product updates, including next-gen vehicle platforms and software-driven improvements. Despite stepping away, Awasthi voiced confidence in Tesla’s future. “I’m confident Tesla will nail its next big mission,” he said, highlighting his belief in the company’s capacity to deliver breakthrough products and improve safety for drivers worldwide.

“This decision wasn’t easy, especially with so much exciting growth on the horizon. Tesla vehicles are incredibly complex systems that often don’t get the credit they deserve, but I’ve witnessed firsthand how they’ve changed lives—for our customers, my friends, and my family—adding real value and, above all, improving safety. I’m confident Tesla will nail its next big mission (especially after last week), and I’m truly excited for the next chapter of my life,” the former Tesla executive wrote.

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Tesla is launching a crazy new Rental program with cheap daily rates

This week, Tesla launched its in-house Rental program that will give people a vehicle for between three to seven days, with prices varying and starting at just $60 per day.

Published

18 hours ago

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November 9, 2025

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(Credit: Tesla)

Tesla is launching a crazy new Rental program with cheap daily rates, giving people the opportunity to borrow a vehicle in the company’s lineup with an outrageous number of perks.

This week, Tesla launched its in-house Rental program that will give people a vehicle for between three to seven days, with prices varying and starting at just $60 per day.

However, there are additional perks that make it a really great deal, including Free Supercharging and Free Full Self-Driving (Supervised) for the duration of the rental.

There are no limits on mileage or charging, although the terms do not allow you to leave the state you are renting.

Tesla wrote in an email advertising the program:

“Rent a Tesla and see how it makes every errand, commute, and road trip more fun. While it’s yours, try Full Self-Driving (Supervised) and control and monitor your vehicle with the Tesla app. 

Schedule your rental for three to seven days starting at $60 per day (plus taxes and fees) and charge for free at any Tesla-owned Supercharger.

Order your own Tesla within seven days of your rental to get up to a $250 credit toward your purchase.”

Tesla has long adopted the mentality that butts in seats will sell cars, and for the most part, it is a great strategy. Driving a Tesla is different from owning and driving a combustion engine vehicle; it truly feels as if you are in a car from the past when you get back in an ICE car.

This strategy could be looked at as more of a way for people to experience Tesla ownership than anything.

Although some might use it as a typical rental program that will see it be a cool way to drive without putting miles on a personal car, most will use it as the 48-hour test drive was designed for, which is a short-term way to experience EV ownership.

Tesla is only offering this program at a handful of locations currently, including San Diego and Costa Mesa, California.

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