Science
The countdown to NASA's Jupiter mission is on. This JPL engineer is helping it happen
Think of meticulously handcrafted objects and certain things come immediately to mind: fine art, exotic cars, luxury timepieces.
But Pasadena native Steve Barajas spends his days building a bespoke item that’s on another level entirely: NASA’s Europa Clipper.
BUSINESS
What do you do for work?
That’s the question My L.A. Workday answers. The series takes you inside a day on the job with some of the city’s most fascinating people. Interviews are edited for length and clarity.
The 13,000-pound behemoth, with a solar-array wingspan the length of a basketball court, is one of the agency’s most ambitious efforts. It’s on an October countdown to launch to Jupiter and its moon Europa, atop a SpaceX Falcon Heavy rocket, to find out if life exists in the deep ocean believed to lie beneath Europa’s icy exterior.
The central body of the $5-billion Europa Clipper arrived in June 2022 at the Pasadena campus of NASA’s Jet Propulsion Laboratory for the painstaking final assembly of components shipped from across the U.S. and Europe. That’s where Barajas comes in.
Barajas, 35, is a mechanical engineer leading a team that, in coordination with other JPL specialists, installs crucial hardware for the ambitious mission. Barajas describes some high points with a parental flair: There’s the magnetometer that could confirm whether an ocean exists beneath the Europa ice; the mass spectrometer that will analyze gases in Europa’s atmosphere; the infrared cameras that will map the moon’s surface composition, temperature and roughness; and the solar panels that will help power the spacecraft instruments.
A model of NASA’s Europa Clipper spacecraft at the Jet Propulsion Laboratory in Pasadena.
(Brian van der Brug / Los Angeles Times)
The project’s momentum to liftoff didn’t spare the Europa Clipper team when JPL in early February laid off 530 people, or about 8% of its workforce, because of uncertainties over congressional funding for NASA. Although the job cuts, the second round this year, were felt “across the NASA family,” NASA Administrator Bill Nelson said, “the Europa Clipper mission will proceed as planned.”
In his official NASA bio, the UC Berkeley graduate recalls his childhood fascination with space. “As a kid, I remember passing the sign along the 210 Freeway that read ‘NASA-JPL Next Exit,’ thinking it was so cool that NASA was so close.”
Barajas, who joined JPL in 2016 from Aerojet Rocketdyne, said his work has taught him the art of delayed gratification. If the Europa Clipper launches on schedule from the Kennedy Space Center, Barajas will have to wait 5½ years for it to arrive at Europa, about 488 million miles from Earth, where it will perform dozens of flybys of the moon to collect data.
“I’m working on a spacecraft that will hopefully find something profound in the future, and working with people who share the same passion,” he said.
When JPL finishes the buildout, Barajas will be part of the team that flies to Florida in May for launch preparations, with liftoff scheduled for as early as Oct. 10 from Kennedy Space Center in Cape Canaveral.
The Times spent a day with Barajas on the job late last year. The interview was edited for length and clarity.
5 a.m.
Barajas starts his day studying a pile of activity reports from the previous day’s work to create a tactical schedule for the mechanical engineers on his team.
Today is a big day for the Europa Clipper team. They’ll be testing the craft’s thermal pumping system, the last major addition to the spacecraft’s vault, a thick-walled aluminum alloy box that holds the spacecraft’s “brain”: its electronics and computers.
An inside look at NASA’s Europa Clipper spacecraft.
(Brian van der Brug / Los Angeles Times)
“The thermal pump is the heart of the spacecraft,” pumping fluid through tubing to control the craft’s temperature, Barajas said. The daylong effort is hazardous because of the high pressure used to test the system with helium, a nonflammable gas.
Mechanical engineer Steve Barajas in a conference room discussing plans with colleagues for the day’s work.
(Brian van der Brug / Los Angeles Times)
7 a.m.
The Europa Clipper’s tall silvery core stands in JPL’s Space Assembly Facility in High Bay 1 clean room, surrounded by temporary scaffolding. In a nearby conference room, Barajas represents the mechanical engineering team as he compares notes for the day ahead with colleagues from the electrical engineering and systems teams.
“Some of what we are discussing are small details. It usually isn’t a massive revamp of the plan,” Barajas said. “It’s trying to get everything organized so that we can provide very clear direction when we meet with the rest of the teams at 7:30.”
Mechanical engineer Steve Barajas dons a gown to protect against contamination in preparation to enter the High Bay Clean Room harboring NASA’s Europa Clipper space probe at the Jet Propulsion Laboratory.
(Brian van der Brug / Los Angeles Times)
9 a.m.
Before any work on the spacecraft begins, Barajas and his colleagues have to don the white protective coveralls known as bunny suits. Barajas will have to repeat the procedure three times before the day ends.
Collegial chatter abounds because some people entering the clean room for the first time need help with the process.
Mechanical engineer Steve Barajas leans over to close the leg of his clean room coveralls. Next, the opening will be taped shut.
(Brian van der Brug / Los Angeles Times)
“Every time we enter the clean room, we have to first put on the bunny suit, which is a very ugly one-piece jumper,” Barajas said. “Empty your pockets; no phones or watches. Shoe covers go on your feet, then there are boots that go on top of those. If you have a beard; there’s a mask to wear for that. Then there’s a face mask and a hood that’s like a fabric helmet goes over that. Then you put on the bunny suit without letting it touch the ground. Then there’s tape on all of the separate parts, joining the legs to the shoes, gloves to the sleeves, etc.”
The process must be repeated after a worker leaves the clean room for lunch or a bathroom break — “It’s one of the daily downsides of the job” — so veterans know, “you’re not able to hydrate as you would normally.”
Next, there is something that looks like a shower stall, buts it’s dry air being blasted at the occupant, hard enough to feel like a wind storm.
On one wall of the clean room hang plaques commemorating missions that date back 63 years, to the Ranger 1 moon mission, when engineers worked on spacecraft in street clothes. But this is not 1961, a time when earthlings weren’t concerned about spreading their biological junk off planet.
“Planetary protection has evolved,” Barajas said of the strict work requirements he has to follow every day. “No one wants to be the person responsible when extra-terrestrial life is finally found and it turns out to be something we brought there from earth.”
Engineers and technicians work on the Europa Clipper, which is surrounded by temporary scaffolding.
(Brian van der Brug / Los Angeles Times)
9:30 a.m.
Inside the clean room, engineers and technicians are making sure all of the fittings on the thermal pump are sufficiently tight.
There is no chatter, no small talk. Everyone is looking intently at the work being done, a level of scrutiny that continues during the testing process. Barajas is there to ensure that members of the thermal team conducting the test have everything they need and the work is going smoothly.
“We have detectors here on the clean room floor that will read whether anything is seeping out. We do this with helium,” Barajas said. It has to be below a certain rate loss. “There will always be some seepage but as long as it’s not too much, we’re OK.”
A JPL employee inspects the Europa Clipper spacecraft during testing of its thermal pumping system.
(Brian van der Brug / Los Angeles Times)
10:30 a.m.
There are two thresholds for success. One is a vacuum test using a wand spraying helium to see if it it is being sucked into the system. The other is the high-pressure test in which helium is pumped through the system to see if gas leaks out.
Any significant leaks will interrupt the tight choreography of the spacecraft’s assembly and testing schedule, less than a year away from launch time.
“We are physically putting the spacecraft together. We are the end of the line,” Barajas said, trying to explain the serious atmosphere in the room. “It’s up to us to verify that the parts we have been sent are working the way they should. Humans aren’t infallible. We’re always looking over each other’s shoulder to make sure we’re doing the job right.”
“I think that’s where the stress comes from, right? That we feel the pressure and the burden of building this vehicle that has been the life’s work of some and years of work for many others.”
The atmosphere is serious during the potentially hazardous thermal pump pressure test, except for “High Bay Bob,” a bunny suit-clad mannequin in the High Bay Clean Room.
(Brian van der Brug / Los Angeles Times)
1 p.m.
It’s lunchtime. You might think that the pressure of tight deadlines would cause Barajas and others on the project to push through to stay on schedule. Bad idea, Barajas said.
“We always make time for lunch,” he said. “What we don’t want is to have hungry people on the floor. Sometimes we cycle people in and out so that the work can continue. Other times we just take a 45-minute break, so the folks can stay focused on the floor when we are having a long day like this.”
Children look through a window into the clean room at JPL where the Europa Clipper spacecraft is assembled.
(Christina House / Los Angeles Times)
2 p.m.
Barajas steps out of the clean room to catch up with phone calls and email.
“In my particular role, the brunt of the day is a lot of behind-the-scenes work,” Barajas said. “To keep things moving, looking ahead to the next job.”
There’s the occasional startling interruption of tour guides speaking in the hall outside his office as they lead groups through JPL’s Spacecraft Assembly Facility. The main attraction is the window into the clean room, where tours can see the spacecraft itself.
“There’s a constant stream of tours during the day. It’s like working in a fishbowl,” Barajas laughs.
3 p.m.
The work day comes to the 3 p.m. change of shift. But Barajas isn’t knocking off; he’s back to the clean room as testing continues. Barajas needs to make sure that the second shift is able to pick up where the first shift left off.
Engineers and technicians under a high gain antenna work on the Europa Clipper.
(Brian van der Brug / Los Angeles Times)
4 p.m.
The tests are done and the teams determine that there were no leaks. But there isn’t even the briefest of celebrations for this achievement.
“We’ve got so much still to do. Interim steps don’t really get much of a response from us,” Barajas said.
Barajas and colleagues turn their focus to the next few days, when they will fill the system with freon and then close the spacecraft’s aluminum vault for good.
“That will be a milestone, not just for us, but for the whole project,” he said.
That might even get a high-five.
Science
Diablo Canyon clears last California permit hurdle to keep running
Central Coast Water authorities approved waste discharge permits for Diablo Canyon nuclear plant Thursday, making it nearly certain it will remain running through 2030, and potentially through 2045.
The Pacific Gas & Electric-owned plant was originally supposed to shut down in 2025, but lawmakers extended that deadline by five years in 2022, fearing power shortages if a plant that provides about 9 percent the state’s electricity were to shut off.
In December, Diablo Canyon received a key permit from the California Coastal Commission through an agreement that involved PG&E giving up about 12,000 acres of nearby land for conservation in exchange for the loss of marine life caused by the plant’s operations.
Today’s 6-0 vote by the Central Coast Regional Water Board approved PG&E’s plans to limit discharges of pollutants into the water and continue to run its “once-through cooling system.” The cooling technology flushes ocean water through the plant to absorb heat and discharges it, killing what the Coastal Commission estimated to be two billion fish each year.
The board also granted the plant a certification under the Clean Water Act, the last state regulatory hurdle the facility needed to clear before the federal Nuclear Regulatory Commission (NRC) is allowed to renew its permit through 2045.
The new regional water board permit made several changes since the last one was issued in 1990. One was a first-time limit on the chemical tributyltin-10, a toxic, internationally-banned compound added to paint to prevent organisms from growing on ship hulls.
Additional changes stemmed from a 2025 Supreme Court ruling that said if pollutant permits like this one impose specific water quality requirements, they must also specify how to meet them.
The plant’s biggest water quality impact is the heated water it discharges into the ocean, and that part of the permit remains unchanged. Radioactive waste from the plant is regulated not by the state but by the NRC.
California state law only allows the plant to remain open to 2030, but some lawmakers and regulators have already expressed interest in another extension given growing electricity demand and the plant’s role in providing carbon-free power to the grid.
Some board members raised concerns about granting a certification that would allow the NRC to reauthorize the plant’s permits through 2045.
“There’s every reason to think the California entities responsible for making the decision about continuing operation, namely the California [Independent System Operator] and the Energy Commission, all of them are sort of leaning toward continuing to operate this facility,” said boardmember Dominic Roques. “I’d like us to be consistent with state law at least, and imply that we are consistent with ending operation at five years.”
Other board members noted that regulators could revisit the permits in five years or sooner if state and federal laws changes, and the board ultimately approved the permit.
Science
Deadly bird flu found in California elephant seals for the first time
The H5N1 bird flu virus that devastated South American elephant seal populations has been confirmed in seals at California’s Año Nuevo State Park, researchers from UC Davis and UC Santa Cruz announced Wednesday.
The virus has ravaged wild, commercial and domestic animals across the globe and was found last week in seven weaned pups. The confirmation came from the U.S. Department of Agriculture’s National Veterinary Services Laboratory in Ames, Iowa.
“This is exceptionally rapid detection of an outbreak in free-ranging marine mammals,” said Professor Christine Johnson, director of the Institute for Pandemic Insights at UC Davis’ Weill School of Veterinary Medicine. “We have most likely identified the very first cases here because of coordinated teams that have been on high alert with active surveillance for this disease for some time.”
Since last week, when researchers began noticing neurological and respoiratory signs of the disease in some animals, 30 seals have died, said Roxanne Beltran, a professor of ecology and evolutionary biology at UC Santa Cruz. Twenty-nine were weaned pups and the other was an adult male. The team has so far confirmed the virus in only seven of the dead pups.
Infected animals often have tremors convulsions, seizures and muscle weakness, Johnson said.
Beltran said teams from UC Santa Cruz, UC Davis and California State Parks monitor the animals 260 days of the year, “including every day from December 15 to March 1” when the animals typically come ashore to breed, give birth and nurse.
The concerning behavior and deaths were first noticed Feb. 19.
“This is one of the most well-studied elephant seal colonies on the planet,” she said. “We know the seals so well that it’s very obvious to us when something is abnormal. And so my team was out that morning and we observed abnormal behaviors in seals and increased mortality that we had not seen the day before in those exact same locations. So we were very confident that we caught the beginning of this outbreak.”
In late 2022, the virus decimated southern elephant seal populations in South America and several sub-Antarctic Islands. At some colonies in Argentina, 97% of pups died, while on South Georgia Island, researchers reported a 47% decline in breeding females between 2022 and 2024. Researchers believe tens of thousands of animals died.
More than 30,000 sea lions in Peru and Chile died between 2022 and 2024. In Argentina, roughly 1,300 sea lions and fur seals perished.
At the time, researchers were not sure why northern Pacific populations were not infected, but suspected previous or milder strains of the virus conferred some immunity.
The virus is better known in the U.S. for sweeping through the nation’s dairy herds, where it infected dozens of dairy workers, millions of cows and thousands of wild, feral and domestic mammals. It’s also been found in wild birds and killed millions of commercial chickens, geese and ducks.
Two Americans have died from the virus since 2024, and 71 have been infected. The vast majority were dairy or commercial poultry workers. One death was that of a Louisiana man who had underlying conditions and was believed to have been exposed via backyard poultry or wild birds.
Scientists at UC Santa Cruz and UC Davis increased their surveillance of the elephant seals in Año Nuevo in recent years. The catastrophic effect of the disease prompted worry that it would spread to California elephant seals, said Beltran, whose lab leads UC Santa Cruz’s northern elephant seal research program at Año Nuevo.
Johnson, the UC Davis researcher, said the team has been working with stranding networks across the Pacific region for several years — sampling the tissue of birds, elephant seals and other marine mammals. They have not seen the virus in other California marine mammals. Two previous outbreaks of bird flu in U.S. marine mammals occurred in Maine in 2022 and Washington in 2023, affecting gray and harbor seals.
The virus in the animals has not yet been fully sequenced, so it’s unclear how the animals were exposed.
“We think the transmission is actually from dead and dying sea birds” living among the sea lions, Johnson said. “But we’ll certainly be investigating if there’s any mammal-to-mammal transmission.”
Genetic sequencing from southern elephant seal populations in Argentina suggested that version of the virus had acquired mutations that allowed it to pass between mammals.
The H5N1 virus was first detected in geese in China in 1996. Since then it has spread across the globe, reaching North America in 2021. The only continent where it has not been detected is Oceania.
Año Nuevo State Park, just north of Santa Cruz, is home to a colony of some 5,000 elephant seals during the winter breeding season. About 1,350 seals were on the beach when the outbreak began. Other large California colonies are located at Piedras Blancas and Point Reyes National Sea Shore. Most of those animals — roughly 900 — are weaned pups.
It’s “important to keep this in context. So far, avian influenza has affected only a small proportion of the weaned at this time, and there are still thousands of apparently healthy animals in the population,” Beltran said in a press conference.
Public access to the park has been closed and guided elephant seal tours canceled.
Health and wildlife officials urge beachgoers to keep a safe distance from wildlife and keep dogs leashed because the virus is contagious.
Science
When slowing down can save a life: Training L.A. law enforcement to understand autism
Kate Movius moved among a roomful of Los Angeles County sheriff’s deputies, passing out a pop trivia quiz and paper prism glasses.
She told them to put on the vision-distorting glasses, and to write with their nondominant hand. As they filled out the tests, Movius moved about the City of Industry classroom pounding abruptly on tables. Then came the cowbell. An aide flashed the overhead lights on and off at random. The goal was to help the deputies understand the feeling of sensory overwhelm, which many autistic people experience when incoming stimulation exceeds their capacity to process.
“So what can you do to assist somebody, or de-escalate somebody, or get information from someone who suffers from a sensory disorder?” Movius asked the rattled crowd afterward. “We can minimize sensory input. … That might be the difference between them being able to stay calm and them taking off.”
Movius, founder of the consultancy Autism Interaction Solutions, is one of a growing number of people around the U.S. working to teach law enforcement agencies to recognize autistic behaviors and ensure that encounters between neurodevelopmentally disabled people and law enforcement end safely.
She and City of Industry Mayor Cory Moss later passed out bags filled with tools donated by the city to aid interactions: a pair of noise-damping headphones to decrease auditory input, a whiteboard, a set of communication cards with words and images to point to, fidget toys to calm and distract.
“The thing about autistic behavior when it comes to law enforcement is a lot of it may look suspicious, and a lot of it may feel very disrespectful,” said Movius, who is also the parent of an autistic 25-year-old man. Responding officers, she said, “are not coming in thinking, ‘Could this be a developmentally disabled person?’ I would love for them to have that in the back of their minds.”
A sheriff’s deputy reads a pamphlet on autism during the training program.
(Genaro Molina / Los Angeles Times)
Autism spectrum disorder is a developmental condition that manifests differently in nearly every person who has it. Symptoms cluster around difficulties in communication, social interaction and sensory processing.
An autistic person stopped by police might hold the officer’s gaze intensely or not look at them at all. They may repeat a phrase from a movie, repeat the officer’s question or temporarily lose their ability to speak. They might flee.
All are common involuntary responses for an autistic person in a stressful situation, which a sudden encounter with law enforcement almost invariably is. To someone unfamiliar with the condition, all could be mistaken for intoxication, defiance or guilt.
Autism rates in the U.S. have increased nearly fivefold since the Centers for Disease Control began tracking diagnoses in 2000, a rise experts attribute to broadening diagnostic criteria and better efforts to identify children who have the condition.
The CDC now estimates that 1 in 31 U.S. 8-year-olds is autistic. In California, the rate is closer to 1 in 22 children.
As diverse as the autistic population is, people across the spectrum are more likely to be stopped by law enforcement than neurotypical peers.
About 15% of all people in the U.S. ages 18 to 24 have been stopped by police at some point in their lives, according to federal data. While the government doesn’t track encounters for disabled people specifically, a separate study found that 20% of autistic people ages 21 to 25 have been stopped, often after a report or officer observation of a person behaving unusually.
Some of these encounters have ended in tragedy.
In 2021, Los Angeles County sheriff’s deputies shot and permanently paralyzed a deaf autistic man after family members called 911 for help getting him to a hospital.
Isaias Cervantes, 25, had become distressed about a shopping trip and started pushing his mother, his family’s attorney said at the time. He resisted as two deputies attempted to handcuff him and one of the deputies shot him, according to a county report.
In 2024, Ryan Gainer’s family called 911 for support when the 15-year-old became agitated. Responding San Bernardino County sheriff‘s deputies shot and killed him outside his Apple Valley home.
Last year, police in Pocatello, Idaho, shot Victor Perez, 17, through a chain-link fence after the nonspeaking teenager did not heed their shouted commands. He died from his injuries in April.
Sheriff’s deputies take a trivia quiz using their non-writing hands, while wearing vision-distorting glasses, as Kate Movius, standing left, and Industry Mayor Cory Moss, right, ring cowbells. The idea was to help them understand the sensory overwhelm some autistic people experience.
(Genaro Molina / Los Angeles Times)
As early as 2001, the FBI published a bulletin on police officers’ need to adjust their approach when interacting with autistic people.
“Officers should not interpret an autistic individual’s failure to respond to orders or questions as a lack of cooperation or as a reason for increased force,” the bulletin stated. “They also need to recognize that individuals with autism often confess to crimes that they did not commit or may respond to the last choice in a sequence presented in a question.”
But a review of multiple studies last year by Chapman University researchers found that while up to 60% of officers have been on a call involving an autistic person, only 5% to 40% had received any training on autism.
In response, universities, nonprofits and private consultants across the U.S. have developed curricula for law enforcement on how to recognize autistic behaviors and adapt accordingly.
The primary goal, Movius told deputies at November’s training session, is to slow interactions down to the greatest extent possible. Many autistic people require additional time to process auditory input and verbal responses, particularly in unfamiliar circumstances.
If at all possible, Movius said, wait 20 seconds for a response after asking a question. It may feel unnaturally long, she acknowledged. But every additional question or instruction fired in that time — what’s your name? Did you hear me? Look at me. What’s your name? — just decreases the likelihood that a person struggling to process will be able to respond at all.
Moss’ son, Brayden, then 17, was one of several teenagers and young adults with autism who spoke or wrote statements to be read to the deputies. The diversity of their speech patterns and physical mannerisms showed the breadth of the spectrum. Some were fluently verbal, while others communicated through signs and notes.
“This population is so diverse. It is so complicated. But if there’s anything that we can show [deputies] in here that will make them stop and think, ‘Hey, what if this is autism?’ … it is saving lives,” Moss said.
Mayor Cory Moss, left, and Kate Movius hug at the end of the training program last November. Movius started Autism Interaction Solutions after her son was born with profound autism.
(Genaro Molina / Los Angeles Times)
Some disability advocates cautioned that it takes more than isolated training sessions to ensure encounters end safely.
Judy Mark, co-founder and president of the nonprofit Disability Voices United, says she trained thousands of officers on safe autism interactions but stopped after Cervantes’ shooting. She now urges families concerned about an autistic child’s safety to call an ambulance rather than law enforcement.
“I have significant concern about these training sessions,” Mark said. “People get comfort from it, and the Sheriff’s Department can check the box.”
While not a panacea, supporters argue that a brief course is better than no preparation at all. Some years ago, Movius received a letter from a man whose profoundly autistic son slipped away as the family loaded their car at the beach. He opened the unlocked door of a police vehicle, climbed into the back and began to flail in distress.
Though surprised, the officer seated at the wheel de-escalated the situation and helped the young man find his family, the father wrote to Movius. He had just been to her training.
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