Connect with us

Science

The countdown to NASA's Jupiter mission is on. This JPL engineer is helping it happen

Published

on

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.

Advertisement

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.

Advertisement

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.”

Advertisement

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.

Advertisement

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)

Advertisement

“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.

Advertisement

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)

Advertisement

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)

Advertisement

“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.

Advertisement

“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.

Advertisement

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)

Advertisement

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.”

Advertisement

“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.

Advertisement

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)

Advertisement

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.

Advertisement

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)

Advertisement

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.

Advertisement

That might even get a high-five.

Science

Very little plastic being recycled in California as state efforts falter

Published

on

Very little plastic being recycled in California as state efforts falter

California touts itself as a leader on the problem of plastic garbage, but recent developments suggest otherwise.

A new report issued by the state’s waste agency shows plastic yogurt containers, shampoo bottles and restaurant takeout trays are being recycled at rates only in the single digits.

  • Share via

    Advertisement

Advertisement

Polypropylene, labeled as #5 on packaging, is used for yogurt containers, margarine tubs and microwavable trays. Only 2% of it is getting recycled. Colored shampoo and detergent bottles, made from polyethylene, or #1 plastic, are getting recycled at a rate of just 5%.

Other plastics, including ones promoted as highly recyclable, such as clear polyethylene bottles, which hold some medications, or hard water bottles, are being recycled at just 16%.

No plastic in the report exceeds a recycling rate of 23%, with the majority reported in just the single digits.

Adding to this disquieting assessment, CalRecycle also just pulled back regulations that were supposed to finalize a landmark single-use plastic law known as Senate Bill 54 — a law designed to make the majority of packaging waste in the state recyclable or compostable by working with the plastic and packaging industries.

The report and delay have sparked a wide variety of reactions by those who have closely watched the law as it was written and implemented.

Advertisement

The proposed regulations were regarded as friendly to industry. As a result, some are hopeful that CalRecycle’s decision to pull them back for tweaking means the agency will make the law stronger. Others say the two developments just show the state has never really been serious about plastic recycling.

“California’s SB 54 … will NEVER increase the recycling rates of these items … because cartons and plastic packaging are fundamentally not technically or economically recyclable,” said Jan Dell, the founder of Orange County-based Last Beach Cleanup, an anti-plastic organization.

Industry representatives are also expressing disappointment, saying the more delays and changes the state makes, the harder it is “for California businesses to comply with the law and implement the resulting changes,” said John Myers, a spokesman for the California Chamber of Commerce, which represents companies that will be affected.

Reports on abysmally low rates of recycling for milk cartons and polystyrene have been widely shared and known. But the newest numbers were still a grim confirmation that there are few options for dealing with these materials.

According to one state analysis, 2.9 million tons of single-use plastic and 171.4 billion single-use plastic components were sold, offered for sale or distributed in California in 2023.

Advertisement

Single-use plastics and plastic waste more broadly are considered a growing environmental and health problem. In recent decades, plastic waste has overwhelmed waterways and oceans, sickening marine life and threatening human health.

Last spring, the Newsom administration was accused of neutering the regulations that CalRecycle had initially proposed to implement the law. The changes excluded all packaging material related to produce, meat, dairy products, dog food, toothpaste, condoms, shampoo and cereal boxes, among other products. These are all products that might fall under the purview of the U.S. Food and Drug Administration and the U.S. Department of Agriculture.

It also opened the door to “alternative” recycling, such as chemical recycling, which environmentalists say is polluting, and was banned in the language of the law.

The waste agency then submitted those draft regulations to the Office of Administrative Law, whose lawyers and staff review proposed regulations to ensure they are “clear, necessary, legally valid, and available to the public” before finalizing them. They were set to release their determination on Friday; CalRecycle pulled the regulations back before the office issued its determination.

Neither the law office nor governor’s office responded to requests for comment.

Advertisement

Melanie Turner, CalRecycle’s spokeswoman, said the agency withdrew its proposed regulations “to make changes … to improve clarity and support successful implementation of the law,” and its revisions were focused on areas that dealt with “food and agricultural commodities.”

California State Sen. Ben Allen (D-Santa Monica), author of the original legislation, called the delay “entirely avoidable” in a statement, but said it would allow CalRecycle an “opportunity to ensure the regulations truly follow the law as it was signed.”

He urged the waste agency and Newsom’s administration not to “allow broad, sweeping exemptions that would undermine the program and increase costs for ratepayers.”

Critics of the watered-down regulations, such as Anja Brandon, the director of plastics policy for the Ocean Conservancy, said she wasn’t surprised by the withdrawal.

The proposed regulations “would have gone beyond CalRecycle’s authority by creating a sweeping categorical exclusion for food and agricultural packaging — effectively a loophole that would have allowed producers to continue putting vast amounts of plastic packaging into the marketplace, completely undermining SB 54’s goals and success,” she said in a text message.

Advertisement

Turner said CalRecycle will conduct a 15-day comment period — although when that begins has not yet been divulged.

Continue Reading

Science

Cancer survival rates soar nationwide, but L.A. doctors warn cultural and educational barriers leave some behind

Published

on

Cancer survival rates soar nationwide, but L.A. doctors warn cultural and educational barriers leave some behind

The American Cancer Society’s 2026 Cancer Statistics report, released Tuesday, marks a major milestone for U.S. cancer survival rates. For the first time, the annual report shows that 70% of Americans diagnosed with cancer can expect to live at least five years, compared with just 49% in the mid-1970s.

The new findings, based on data from national cancer records and death statistics from 2015 to 2021, also show promising progress in survival rates for people with the deadliest, most advanced and hardest-to-treat cancers when compared with rates from the mid-1990s. The five-year survival rate for myeloma, for example, nearly doubled (from 32% to 62%). The survival rate for liver cancer tripled (from 7% to 22%), for late-stage lung cancer nearly doubled (from 20% to 37%), and for both melanoma and rectal cancer more than doubled (from 16% to 35% and from 8% to 18%, respectively).

For all cancers, the five-year survival rate more than doubled since the mid-1990s, rising from 17% to 35%.

This also signals a 34% drop in cancer mortality since 1991, translating to an estimated 4.8 million fewer cancer deaths between 1991 and 2023. These significant public health advances result from years of public investment in research, early detection and prevention, and improved cancer treatment, according to the report.

“This stunning victory is largely the result of decades of cancer research that provided clinicians with the tools to treat the disease more effectively, turning many cancers from a death sentence into a chronic disease,” said Rebecca Siegel, senior scientific director at the American Cancer Society and lead author of the report.

Advertisement

As more people survive cancer, there is also a growing focus on the quality of life after treatment. Patients, families and caregivers face physical, financial and emotional challenges. Dr. William Dahut, the American Cancer Society’s chief scientific officer, said that ongoing innovation must go hand in hand with better support services and policies, so all survivors — not just the privileged — can have “not only more days, but better days.”

Indeed, the report also shows that not everyone has benefited equally from the advances of the last few decades. American Indian and Alaska Native people now have the highest cancer death rates in the country, with deaths from kidney, liver, stomach and cervical cancers about double that of white Americans.

Additionally, Black women are more likely to die from breast and uterine cancers than non-Black women — and Black men have the highest cancer rates of any American demographic. The report connects these disparities in survival to long-standing issues such as income inequity and the effects of past discrimination, such as redlining, affecting where people live — forcing historically marginalized populations to be disproportionately exposed to environmental carcinogens.

Dr. René Javier Sotelo, a urologic oncologist at Keck Medicine of USC, notes that the fight against cancer in Southern California, amid long-standing disparities facing vulnerable communities, is very much about overcoming educational, cultural and socioeconomic barriers.

While access to care and insurance options in Los Angeles are relatively robust, many disparities persist because community members often lack crucial information about risk factors, screening and early warning signs. “We need to insist on the importance of education and screening,” Sotelo said. He emphasized that making resources, helplines and culturally tailored materials readily available to everyone is crucial.

Advertisement

He cites penile cancer as a stark example: rates are higher among Latino men in L.A., not necessarily due to lack of access, but because of gaps in awareness and education around HPV vaccination and hygiene.

Despite these persisting inequities, the dramatic nationwide improvement in cancer survival is unquestionably good news, bringing renewed hope to many individuals and families. However, the report also gives a clear warning: Proposed federal cuts to cancer research and health insurance could stop or even undo these important gains.

“We can’t stop now,” warned Shane Jacobson, the American Cancer Society’s chief executive.

“We need to understand that we are not yet there,” Sotelo concurred. ”Cancer is still an issue.”

Advertisement
Continue Reading

Science

Clashing with the state, L.A. City moves to adopt lenient wildfire ‘Zone Zero’ regulations

Published

on

Clashing with the state, L.A. City moves to adopt lenient wildfire ‘Zone Zero’ regulations

As the state continues multiyear marathon discussions on rules for what residents in wildfire hazard zones must do to make the first five feet from their houses — an area dubbed “Zone Zero” — ember-resistant, the Los Angeles City Council voted Tuesday to start creating its own version of the regulations that is more lenient than most proposals currently favored in Sacramento.

Critics of Zone Zero, who are worried about the financial burden and labor required to comply as well as the detrimental impacts to urban ecosystems, have been particularly vocal in Los Angeles. However, wildfire safety advocates worry the measures endorsed by L.A.’s City Council will do little to prevent homes from burning.

“My motion is to get advice from local experts, from the Fire Department, to actually put something in place that makes sense, that’s rooted in science,” said City Councilmember John Lee, who put forth the motion. “Sacramento, unfortunately, doesn’t consult with the largest city in the state — the largest area that deals with wildfires — and so, this is our way of sending a message.”

Tony Andersen — executive officer of the state’s Board of Forestry and Fire Protection, which is in charge of creating the regulations — has repeatedly stressed the board’s commitment to incorporating L.A.’s feedback. Over the last year, the board hosted a contentious public meeting in Pasadena, walking tours with L.A. residents and numerous virtual workshops and hearings.

Advertisement
  • Share via

Advertisement

Some L.A. residents are championing a proposed fire-safety rule, referred to as “Zone Zero,” requiring the clearance of flammable material within the first five feet of homes. Others are skeptical of its value.

With the state long past its original Jan. 1, 2023, deadline to complete the regulations, several cities around the state have taken the matter into their own hands and adopted regulations ahead of the state, including Berkeley and San Diego.

“With the lack of guidance from the State Board of Forestry and Fire Protection, the City is left in a precarious position as it strives to protect residents, property, and the landscape that creates the City of Los Angeles,” the L.A. City Council motion states.

Advertisement

However, unlike San Diego and Berkeley, whose regulations more or less match the strictest options the state Board of Forestry is considering, Los Angeles is pushing for a more lenient approach.

The statewide regulations, once adopted, are expected to override any local versions that are significantly more lenient.

The Zone Zero regulations apply only to rural areas where the California Department of Forestry and Fire Protection responds to fires and urban areas that Cal Fire has determined have “very high” fire hazard. In L.A., that includes significant portions of Silver Lake, Echo Park, Brentwood and Pacific Palisades.

Fire experts and L.A. residents are generally fine with many of the measures within the state’s Zone Zero draft regulations, such as the requirement that there be no wooden or combustible fences or outbuildings within the first five feet of a home. Then there are some measures already required under previous wildfire regulations — such as removing dead vegetation like twigs and leaves, from the ground, roof and gutters — that are not under debate.

However, other new measures introduced by the state have generated controversy, especially in Los Angeles. The disputes have mainly centered around what to do about trees and other living vegetation, like shrubs and grass.

Advertisement

The state is considering two options for trees: One would require residents to trim branches within five feet of a house’s walls and roof; the other does not. Both require keeping trees well-maintained and at least 10 feet from chimneys.

On vegetation, the state is considering options for Zone Zero ranging from banning virtually all vegetation beyond small potted plants to just maintaining the regulations already on the books, which allow nearly all healthy vegetation.

Lee’s motion instructs the Los Angeles Fire Department to create regulations in line with the most lenient options that allow healthy vegetation and do not require the removal of tree limbs within five feet of a house. It is unclear whether LAFD will complete the process before the Board of Forestry considers finalized statewide regulations, which it expects to do midyear.

The motion follows a pointed report from LAFD and the city’s Community Forest Advisory Committee that argued the Board of Forestry’s draft regulations stepped beyond the intentions of the 2020 law creating Zone Zero, would undermine the city’s biodiversity goals and could result in the loss of up to 18% of the urban tree canopy in some neighborhoods.

The board has not decided which approach it will adopt statewide, but fire safety advocates worry that the lenient options championed by L.A. do little to protect vulnerable homes from wildfire.

Advertisement

Recent studies into fire mechanics have generally found that the intense heat from wildfire can quickly dry out these plants, making them susceptible to ignition from embers, flames and radiant heat. And anything next to a house that can burn risks taking the house with it.

Another recent study that looked at five major wildfires in California from the last decade, not including the 2025 Eaton and Palisades fires, found that 20% of homes with significant vegetation in Zone Zero survived, compared to 37% of homes that had cleared the vegetation.

Continue Reading

Trending