Science
Space to Grow – UVic
Astrophysicist Julie Claveau, BSc ’09, has taken a fascinating career trajectory to her current work on the James Webb Telescope, which will reveal new secrets of the universe.
For someone who’s spent most her life gazing up at the stars, Julie Claveau is very down to earth. Take a quick orbit around the UVic Science grad’s social media universe and you’ll discover Claveau is not only a Program Scientist for the Canadian Space Agency (CSA) who’s been working on the newly launched James Webb Space Telescope, but a mother of three, a blogger, a YouTuber, an avid World of Warcraft gamer, violinist, dancer and former lifeguard. Her Instagram feed straddles the seemingly distant galaxies of astronomy, family, gardening and baking.
“People often have these stereotypes that if you’re an astrophysicist you’re this kind of person… But there are so many different facets of a person that adds to what they have to offer to the world, or a team,” Claveau says on a Zoom call from her home in Montreal while intermittently getting interrupted by one of her school-aged children. “I really want to give back to the world just so people can learn from what I know.”
The trajectory of Claveau’s journey to working with the international space community on a $10-billion telescope that’s been billed as one of the most ambitious engineering initiatives ever attempted is far from a straight line. There are stops along the way in Australia, Kitimat and Victoria. Her job experience includes everything from working in fast-food drive-thrus to a decade of climbing the rungs of federal bureaucracy.
Claveau became enthralled by outer space as a child when she would lie on the lawn, night or day, and stare up at the sky. “I would lie there for hours trying to imagine how far infinity was. Like, ‘Oh, I’m looking this far… but it keeps going and it keeps going,’” she says. “It was a very mind-blowing concept to wrap my young brain around, that I still can’t wrap my head around today.”
Claveau grew up in Chicoutimi, Quebec, lived in Australia with her family for a time (where she became fluent in English) and graduated from high school in Kitimat, before enrolling at UVic as a science student. She eventually narrowed her focus to physics and astronomy.
“That’s where all of my loves are. There was enough challenging problem-solving to satisfy my thirst. There was enough creativity and freedom in order for me to express myself. So that really was the turning point.… When I found physics and astronomy [at UVic], it was so true to my heart, it was so engrained in my soul, it just made me so inherently happy that I knew I found my place.”
Julio Navarro was Claveau’s astronomy professor.
There are those students who are very proactive, and they are always trying to get to know more. Calveau was very intense, as well. She would come to my office hours and ask me questions, so she was very passionate about astronomy. I think that’s one of the things that separates her from an average student—this passion for astronomy that you only see rarely.”
—Julio Navarro, UVic cosmologist
While attending UVic, Claveau subsidized her studies by working as a naval reservist at HMCS Malahat. Her father had been in the military and she was an air cadet in high school, so it was a natural fit. After graduating from UVic in 2009, Claveau returned to Quebec, feeling aimless and unsure of what to do with her physics degree.
After a few years working for Health Canada, Claveau realized she needed a change. She saw there was an opening at the Canada Space Agency for a mission planner for the RADARSAT-2 Earth observation satellite. Her background in physics, military operations, administration and project management ticked all the boxes.
Once at CSA, Claveau made it known that she was an astrophysicist and wanted to work in astronomy. Colleagues noted her passion and drive. Word got around and two years ago, she became Program Scientist for Space Astronomy, acting as a conduit between Canada and other countries, governments, space agencies and universities. Her primary focus, however, has been the James Webb Space Telescope mission. More than 25 years and $10 billion in the making, the Webb Telescope is a collaboration between NASA, CSA and the European Space Agency (ESA), involving more than 1,000 people from 17 different countries.
Webb is often described as the successor to the Hubble Space Telescope, which launched in 1990 and has well exceeded its 10-year life expectancy, but it’s different, says Claveau. For one thing, it’s bigger. Webb’s primary mirror is 6.5-metres across, compared to Hubble’s 2.4-metre span, and consists of 18 gold–coated hexagonal sections resembling a honeycomb.
Webb’s home is also considerably farther away. Whereas Hubble floats 547 kilometres above Earth, Webb orbits the sun in line with Earth, 1.5 million kilometres away at what is called the second Lagrange point or L2. Due to its proximity to the sun, Webb relies on a tennis court-sized sunshield, which, along with the mirrors, had to be folded up in an origami pattern in order to fit into its rocket.
Unlike Hubble, Webb is designed to capture infrared light, allowing the telescope to see farther into the universe than ever before, which will allow scientists to better understand how planets, stars and galaxies are born and evolve over time. Claveau compares Webb to a time machine.
“We will be able to see about 13.5 billion years ago, because light takes time to travel,” Claveau says. “The light of our sun takes about eight minutes to get to us… So, when you look at the sun, you are actually looking eight minutes into the past.”
When we use Webb to look at this far distant light, we’ll be looking back at the beginning of the universe. Just being able to see that will have tremendous impacts on every single field of astronomy possible. We might discover things that we never thought existed… It’s going to completely revolutionize astronomy and our general understanding of the universe.”
—Julie Claveau, UVic Class ’09
Canada’s contribution to Webb is also significant. The CSA provided the telescope’s Fine Guidance Sensor (FGS) and the Near-Infrared Imager and Slitless Spectrograph (NIRISS). The FGS helps Webb point and focus on specific objects with an accuracy Claveau compares to “seeing a baby’s hair from a kilometre away.” The NIRISS contains a highly sensitive camera that will determine the atmospheric compositions of exoplanets, which are planets light years beyond our solar system that orbit stars other than the sun.
“So far, we’ve been able to identify exoplanets… but we don’t know if they are inhabitable or if there could potentially be life there,” Claveau says. “With Webb, we will be able to know the composition of the atmospheres of those exoplanets, which means we will potentially find new life or habitable planets.”
Although Webb was launched into orbit on Christmas Day in 2021 from French Guiana on an ESA Ariane 5 rocket, it will take approximately five to six months before the first official images are produced and transmitted back to Earth. Thanks to Canada’s contributions, Canadian scientists are guaranteed at least five per cent of Webb’s observation time and will be among the first to benefit from Webb’s powerful instruments.
Claveau is also co-chair of the Women in STEM Advisory Committee at the Canadian Space Agency, and is helping organize a 2023 event with the United Nations Office for Outer Space Affairs (UNOOSA) to promote women’s empowerment in space.
Never stop looking up—I think it was Stephen Hawkings who said that. As humans we are always looking down at our feet or we’re focused on our day-to-day existence. But the moment you start looking up, you have an out-of-body experience where you feel so small and immediately you are in wonder. Be curious, look up and dare to dream.”
—Claveau
Science
April 20: Why this Indigenous researcher thinks we can do science differently and more… – CBC.ca
Quirks and Quarks54:00Why this Indigenous researcher thinks we can do science differently, and more…
On this episode of Quirks & Quarks with Bob McDonald:
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Physicists exploring the nature of reality need ever more capable particle colliders, so they’re exploring a successor to the Large Hadron Collider in Europe. But that new machine is at least decades away. Tova Holmes, an assistant professor at the University of Tennessee, Knoxville, is one of the physicists calling for a different kind of collider that can come online before the end of her career – or her life. This device would use a particle not typically used in particle accelerators: the muon.
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Quirks and Quarks6:51Is venting the best way to deal with anger? The scientist says chill out
It turns out that acting out your anger might not be the best way to get rid of it. Sophie Kjaervik, a researcher at Virginia Commonwealth University in Richmond, Va., analyzed 154 studies of the different ways to deal with anger. Her results, published in the journal Clinical Psychology Review, suggest that techniques that reduce your heart rate and calm your mind are more effective than blowing off steam.
High intensity wildfires may release toxic forms of metals
Quirks and Quarks8:37High intensity wildfires may release toxic forms of metals
Wildfire smoke might be more dangerous than you think. A recent study in the journal Nature Communications found that when wildfires pass over soils or rocks rich in a normally harmless metal called chromium, it is transformed into a toxic form. The hotter and more intense the wildfire is, the more of this metal becomes toxic. Scott Fendorf, an Earth system science professor at Stanford University, said this study shows we should factor in the type of geology wildfires pass over to provide more targeted air quality warnings about smoke risks.
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Conspiracy theories seem to have multiplied in the internet era and so far, we haven’t had much luck in debunking these beliefs. The preliminary findings of a new study on PsyArXiv, a site for psychology studies that have yet to be peer-reviewed, suggests that artificial intelligence may have more success. Thomas Costello, a postdoctoral psychology researcher at MIT was the lead author on this study, and said their findings can provide a window into how to better debunk conspiracy beliefs.
An Indigenous scientist explores the medicine the Earth needs
Quirks and Quarks19:12An Indigenous ecologist on why we need to stop and listen to save the planet
Earth day is April 22. And Earth is not in great shape to celebrate the day. Overheated, overpopulated, overexploited – we’re not being particularly careful with our planet. We talk to Indigenous ecologist Jennifer Grenz of the University of British Columbia about her new book, which is part memoir, part prescription for the medicine our planet needs – a compound of science and traditional wisdom. Her book is Medicine Wheel for the Planet: A journey toward personal and ecological healing.
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In a remarkable development, NASA has given the green light to the Dragonfly mission, a revolutionary rotorcraft designed to investigate the complex chemistry of Saturn‘s moon Titan.
This confirmation allows the mission to proceed with the final design, construction, and testing of the spacecraft and its scientific instruments.
Deciphering the prebiotic chemistry on Titan
The Dragonfly mission, led by Dr. Melissa Trainer of NASA’s Goddard Space Flight Center, will carry a cutting-edge instrument called the Dragonfly Mass Spectrometer (DraMS).
This powerful tool will help scientists delve into the intricate chemistry at work on Titan, potentially shedding light on the chemical processes that led to the emergence of life on Earth, known as prebiotic chemistry.
“We want to know if the type of chemistry that could be important for early pre-biochemical systems on Earth is taking place on Titan,” explains Dr. Trainer, a planetary scientist and astrobiologist specializing in Titan.
Titan: Dragonfly’s target
Titan, the largest moon of Saturn, is shrouded in a dense nitrogen-rich atmosphere, bears a striking resemblance to Earth in many ways. With a diameter of 5,150 kilometers, Titan is the second-largest moon in our solar system, surpassed only by Jupiter’s Ganymede.
Dense atmosphere and unique climate
One of Titan’s most distinctive features is its thick atmosphere, which is composed primarily of nitrogen and methane. This dense atmosphere creates a surface pressure 1.5 times higher than Earth’s, making it the only moon in our solar system with a substantial atmosphere.
The presence of methane in Titan’s atmosphere leads to a fascinating hydrological cycle, similar to Earth’s water cycle, but with methane as the primary liquid.
Titan’s surface is dotted with numerous lakes and seas of liquid hydrocarbons, predominantly methane and ethane. These liquid bodies, some of which are larger than the Great Lakes on Earth, are the result of Titan’s unique climate and atmospheric conditions.
The Cassini mission, which explored the Saturn system from 2004 to 2017, provided stunning images and data of these extraterrestrial lakes and seas.
Dragonfly mission to search Titan for prebiotic chemistry and life
The complex chemistry occurring on Titan’s surface and in its atmosphere has drawn significant attention from astrobiologists.
With its abundant organic compounds and the presence of liquid methane, Titan is considered a prime candidate for studying prebiotic chemistry and the potential for life to emerge in environments different from Earth.
Beneath Titan’s icy crust lies another intriguing feature: a global subsurface ocean of liquid water and ammonia. This ocean, which is believed to be salty and have a high pH, may potentially host microbial life.
The presence of this subsurface ocean, along with the unique chemistry on Titan’s surface, makes this moon a fascinating target for future exploration and scientific research.
Pushing the boundaries of rotorcraft exploration
Nicky Fox, associate administrator of the Science Mission Directorate at NASA Headquarters, emphasized the significance of the Dragonfly mission, stating, “Exploring Titan will push the boundaries of what we can do with rotorcraft outside of Earth.”
Titan’s unique characteristics, including its abundant complex carbon-rich chemistry, interior ocean, and past presence of liquid water on the surface, make it an ideal destination for studying prebiotic chemical processes and the potential habitability of an extraterrestrial environment.
Innovative design and cutting-edge technology
The Dragonfly robotic rotorcraft will leverage Titan’s low gravity and dense atmosphere to fly between different points of interest on the moon’s surface, spanning several miles apart.
This innovative approach allows the entire suite of instruments to be relocated to new sites once the previous one has been thoroughly explored, providing access to samples from diverse geological environments.
DraMS, developed by the same team responsible for the Sample Analysis at Mars (SAM) instrument suite aboard the Curiosity rover, will analyze surface samples using techniques tested on Mars.
Dr. Trainer emphasized the benefits of this heritage, stating, “This design has given us an instrument that’s very flexible, that can adapt to the different types of surface samples.”
Dragonfly mission challenges and funding
The Dragonfly mission successfully passed its Preliminary Design Review in early 2023. However, due to funding constraints, the mission was asked to develop an updated budget and schedule.
The revised plan, presented and conditionally approved in November 2023, hinged on the outcome of the fiscal year 2025 budget process.
With the release of the president’s fiscal year 2025 budget request, Dragonfly is now confirmed with a total lifecycle cost of $3.35 billion and a launch date set for July 2028.
This reflects a cost increase of approximately two times the initially proposed cost and a delay of more than two years from the original selection in 2019.
Despite the challenges posed by funding constraints, the COVID-19 pandemic, supply chain issues, and an in-depth design iteration, NASA remains committed to the Dragonfly mission.
Additional funding has been provided for a heavy-lift launch vehicle to shorten the mission’s cruise phase and compensate for the delayed arrival at Titan.
Rigorous testing and validation
To ensure the success of the Dragonfly mission, researchers on Earth have conducted extensive testing and validation of the designs and models for the nuclear-powered, car-sized drone.
The mission team has carried out test campaigns at NASA’s Langley Research Center, utilizing the Subsonic Tunnel and the Transonic Dynamics Tunnel (TDT) to validate computational fluid dynamics models and gather data under simulated Titan atmospheric conditions.
Ken Hibbard, Dragonfly mission systems engineer at APL, emphasized the importance of these tests, stating, “All of these tests feed into our Dragonfly Titan simulations and performance predictions.”
As the Dragonfly mission progresses, it marks a new era of exploration and scientific discovery. Dr. Trainer expressed her excitement, saying, “Dragonfly is a spectacular science mission with broad community interest, and we are excited to take the next steps on this mission.”
Turning science fiction into fact with the Dragonfly mission
In summary, the Dragonfly mission embodies the essence of human curiosity and the relentless pursuit of knowledge. As NASA prepares to send this revolutionary rotorcraft to the alien world of Titan, we stand on the brink of a new era of exploration and discovery.
With its innovative design, cutting-edge technology, and the unwavering dedication of the mission team, Dragonfly will unlock the secrets of prebiotic chemistry and shed light on the potential for life beyond Earth.
As we eagerly await the launch of this titanic mission, we can only imagine the wonders that await us on Saturn’s enigmatic moon. The Dragonfly mission is a testament to the indomitable human spirit and our boundless capacity to push the frontiers of knowledge.
In the words of Ken Hibbard, “With Dragonfly, we’re turning science fiction into exploration fact,” and that fact will undoubtedly inspire generations to come.
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Science
Marine plankton could act as alert in mass extinction event: UVic researcher – Langley Advance Times
A University of Victoria micropaleontologist found that marine plankton may act as an early alert system before a mass extinction occurs.
With help from collaborators at the University of Bristol and Harvard, Andy Fraass’ newest paper in the Nature journal shows that after an analysis of fossil records showed that plankton community structures change before a mass extinction event.
“One of the major findings of the paper was how communities respond to climate events in the past depends on the previous climate,” Fraass said in a news release. “That means that we need to spend a lot more effort understanding recent communities, prior to industrialization. We need to work out what community structure looked like before human-caused climate change, and what has happened since, to do a better job at predicting what will happen in the future.”
According to the release, the fossil record is the most complete and extensive archive of biological changes available to science and by applying advanced computational analyses to the archive, researchers were able to detail the global community structure of the oceans dating back millions of years.
A key finding of the study was that during the “early eocene climatic optimum,” a geological era with sustained high global temperatures equivalent to today’s worst case global warming scenarios, marine plankton communities moved to higher latitudes and only the most specialized plankton remained near the equator, suggesting that the tropical temperatures prevented higher amounts of biodiversity.
“Considering that three billion people live in the tropics, the lack of biodiversity at higher temperatures is not great news,” paper co-leader Adam Woodhouse said in the release.
Next, the team plans to apply similar research methods to other marine plankton groups.
Read More: Global study, UVic researcher analyze how mammals responded during pandemic
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