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

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3 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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Investor's Corner

Tesla still poised to earn $3B in ZEV credits this year: Piper Sandler

Piper Sandler analyst Alex Potter maintained his $400 per share price target on TSLA stock.

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6 minutes ago

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July 22, 2025

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Credit: Tesla

Tesla (NASDAQ:TSLA) is still poised to earn about $3 billion in zero-emission vehicle (ZEV) credits this year despite growing concerns over policy shifts under United States President Donald Trump. This is, at least, according to Piper Sandler analyst Alex Potter, who maintained his $400 per share price target and “Overweight” rating on TSLA stock.

Tesla’s ZEV credit revenue

In a recent investor note, Potter acknowledged that Trump’s efforts to undo EV-related incentives could impact Tesla’s ZEV credit income. The analyst noted that these effects would likely not be too drastic, however, even if ZEV credits provide Tesla’s finances with a substantial boost. Last year, Tesla earned about $3.5 billion from regulatory credits, equal to nearly 100% of the company’s FY24 free cash flow, as noted in a Benzinga report. 

Potter estimated that the impact of potential regulatory reversals from the Trump administration will likely not be immediate. “Tesla will still book around $3B in credits this year, followed by $2.3B in 2026,” the Piper Sandler analyst wrote.

Considering his reiterated $400 price target for Tesla stock, Potter seems to be expecting an upside of over 20% for the electric vehicle maker. It should be noted, however, that Tesla is a volatile stock by nature, so huge swings in stock price may happen even without material developments from the company.

Robotaxi developments

The Piper Sandler analyst also highlighted the progress of Tesla’s Full Self-Driving (FSD) program and Robotaxi developments as potential offsets to regulatory headwinds. Potter pointed to expanding operations in Austin and Tesla’s push to launch Robotaxi services in Phoenix and the Bay Area, pending regulatory approval. 

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“In our view, these favorable FSD-related developments are likely to overshadow any/all negative commentary arising from lower 2025/2026 estimates,” the analyst wrote.

In addition to rescinding ZEV programs, the Trump administration has proposed ending the $7,500 federal EV credit by September 2025 and rolling back Corporate Average Fuel Economy (CAFE) standards.

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Tesla sees 9,900 new vehicle registrations in China in July’s third week

Tesla introduced minor updates to the Model 3 and Model Y long-range variants recently.

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1 hour ago

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July 22, 2025

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Credit: Tesla Asia/X

Tesla recorded 9,900 new vehicle insurance registrations in China during the week of July 14–20, a 19.3% decline from the 12,270 units that were listed in the prior week. The drop follows a sharp surge in early July, when registrations rose 145% week-over-week.

Weekly registrations dip after early July surge

Tesla’s drop in insurance registrations last week follows a notable spike earlier this month. During the week of July 7–13, the company registered 12,300 vehicles, up 145% from just 5,010 units the week before. That surge was largely driven by strong domestic demand for the locally produced Model Y crossover and Model 3 sedan, both built at Tesla’s Gigafactory Shanghai.

Tesla introduced minor updates to both long-range models recently, as well as a minor price increase for the Model 3. The Model Y’s pricing remained unchanged, a move that likely helped maintain momentum in the highly competitive Chinese EV market, as noted n a CNEV Post report. Despite the recent dip, the Model Y continues to lead Tesla’s local deliveries, highlighting its role as the company’s top seller in China.

June sales remain strong despite lower exports

Tesla’s June wholesale figures in China totaled 71,599 vehicles, up 0.83% year-over-year and 16.1% from May, according to the China Passenger Car Association (CPCA). Retail sales in the country reached 61,484 units, making June Tesla’s second-highest domestic month of the year, behind only March. The figures suggest that the Model Y and Model 3 are seeing some stable demand in China, despite emerging competition and pricing pressure in the local EV segment.

However, exports from Gigafactory Shanghai dropped to 10,115 units in June, down 13.9% from last year and over 56% from May. The shift suggests Tesla may be prioritizing domestic deliveries ahead of new product introductions. Tesla, after all, is expected to launch the six-seat variant of the Model Y, called the Model Y L, in China in the coming months.

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Tesla Supercharger Diner officially opens: menu, prices, features, and more

Tesla’s Supercharger Diner in Los Angeles is open after seven years in the making.

Published

11 hours ago

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July 21, 2025

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tesla diner in los angeles during daytime
Credit: Matt Hartman

Tesla has officially opened its Supercharger Diner in Los Angeles to the public for the first time. It is an 80-Supercharger lot with two movie screens and a full-service 24/7 diner that serves a wide variety of locally sourced food for patrons while they charge or even just stop by.

It is not exclusive to Tesla owners, as anyone can stop by to experience the Diner and movie theater. It officially opened to the public at 4:20 p.m. local time.

In 2018, CEO Elon Musk said he was hoping to build a full-scale 50s era diner that served as a drive-in movie theater. Seven years later, it has officially come to life, and in typical Tesla fashion, it opened at a very appropriate time of day. We heard of people waiting as many as 13 hours for the site to open.

Tesla Diner Menu

BURGERS & SANDWICHES

  • Tesla Burger: $13.5
    • 1/3 lb. prime Brandt Beef with New School American cheese, lettuce, caramelized onions, pickles and Electric Sauce on a Martin’s Potato Roll
    • Add bacon: $3
    • Add Wagyu beef chili: $3
    • Add organic free-range fried egg: $2
    • Sub veggie patty
  • Hot Dog: $13
    • All-beef Snap-o-Razzo hot dog with mustard and onion pickle relish on a Martin’s Potato Roll. Served with fried potatoes
    • Add New School cheese sauce: $1
    • Add Wagyu beef chili: $1
  • Diner Club Sandwich: $13
    • Roasted turkey, Epio Bacon, blistered cherry tomatoes, lettuce, avocado and maple black pepper mayo on toasted Tartine buttermilk bread
  • Tuna Melt: $14
    • Wild-caught albacore tuna salad with New School American cheese and pickles on grilled Tartine buttermilk bread
  • Fried Chicken & Waffles: $15
    • Classic or spicy pickle-brined organic free-range chicken between two buttermilk waffles with maple black pepper mayo
    • Add New School cheese sauce: $1
    • Add bacon: $2
    • Add organic free-range fried egg: $3
    • Sub Martin’s Potato Roll
  • Grilled Cheese: $9
    • New School American cheese on grilled Tartine buttermilk bread
    • Add blistered tomatoes: $1
    • Add Avocado: $1.50
    • Add Epic Bacon: $3

ALL-DAY BREAKFAST

  • Egg Sandwich: $12
    • Two organic free-range scrambled eggs on a Martin’s Potato Roll with Epic Bacon, New School American cheese, baby arugula and Electric Sauce
    • Add avocado: $1.50
    • Substitute waffle Avocado Toast: $11
    • Sliced avocado, lime, tomatoes, pepitas, radish and arugula on toasted Tartine buttermilk bread
  • Greek Yogurt Parfait: $9
    • Strauss Creamery organic Greek yogurt, roasted strawberries, organic gluten-free granola and local honey
  • Breakfast Tacos: $9
    • Organic free-range scrambled eggs, beef chorizo, crispy potatoes and New School American cheese sauce folded inside two Tehachapi Grain Project organic flour tortillas. Served with a side of avocado crema
    • Sub bacon: $1
    • Add avocado: $1.50 Biscuits & Red Gravy: $15
  • Buttermilk biscuit with beef chorizo gravy and an organic free-range fried egg
  • House-Baked Cinnamon Roll: $7
    • Warm, frosted cinnamon roll with flaky salt

SIDES

  • Tallow-fried French fries: $4
    • Make it a cheese fries: $1 extra
    • Make it Wagyu chili cheese fries: $3 extra
  • Hash Brown Bites: $8
    • Crispy, tallow-fried shredded potatoes served with choice of dip
  • Wagyu Beef Chili Cup: $8
    • RC Provisons Wagyu beef chili with diced white onion and New School American cheese sauce
  • Buttermilk Waffle: $5 • Dusted with powdered sugar, served with real maple syrup
  • Market Salad: $10
    • Market kale and arugula, blistered cherry tomatoes, radishes, celery, shredded carrots, avocado, salted pepitas and toasted breadcrumbs.
    • Served with Dilly Ranch
    • Add roasted turkey: $3
    • Add fried chicken: $3.50
    • Add veggie patty: $4.50
    • Add tuna salad: $5
  • Epic Bacon:
    • $12 Four strips of maple-glazed black pepper bacon served with choice of dip

KIDS MENU

  • Kids Burger: $13
    • Prime Brandt Beef with New School American cheese
  • Kids’ Grilled Cheese: $13
    • New School American cheese on grilled Tartine buttermilk bread. No crust
  • Chicken Tenders: $13
    • Made with organic free-range chicken

DESSERTS

  • Soft Serve: $6
    • Chocolate, vanilla or swirl
  • Slice of Pie à la Mode: $12
    • Warm slice of Winston’s apple or pecan pie (gf) served with Valley Ford Creamery softserve a la mode
  • Chocolate Chip Cookie: $5
    • Warm chocolate chip cookie with flaky sea salt

DRINKS

  • Cane sugar sodas: $4 each: Cola, diet cola, lemon-lime, root beer, orange, black cherry or cream.
  • Milkshakes $8
    • Vanilla, chocolate or strawberry. Make it a Pie Shake for an extra $4
    • (apple or pecan).
  • Lemonade: $4
  • Organic Draft Kombucha: $8
  • Drip Coffee: $4
  • Nitro Cold Brew: $4.5
  • Espresso (hot, iced, decaf): $4
  • Cappuccino (hot, iced, decaf): $5.5
  • Latte (hot, iced, decaf): $6
  • Iced Nitro Matcha: $6.5
  • Charged Sodas:
    • Creamsicle: $7
      • Orange soda, cream soda, vanilla foam, fresh orange and orange popping boba
    • Shirley Temple: $7
      • Lemon-lime soda, grenadine, fresh lime and maraschino cherries
    • Lime Rickey: $7
      • Lemon-lime soda and fresh lime
    • Catawba Flip: $7
      • Grape soda, vanilla foam, nutmeg and grapes
    • Dirty Kombucha: $10
      • Citrus kombucha, vanilla foam, fresh orange and lime, maraschino cherries.

Tesla Diner Details

The opening of the Diner was launched by Franz von Holzhausen, Tesla’s Chief Designer:

There is also merchandise available at the Diner, including:

  • Tesla Bot Action Figure
  • Hollywood Retro Diner Tee
  • Tesla Sweets | Supercharged Gummies: Dog Mode Chill, Mango Bolt, and CyberBerry
  • Tesla Diner Trucker Hat
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