Arizona State University doctoral candidates Tanner Barnes and Vince Debes each take pleasure in hike.
But after they set out on trails in locations like Yellowstone National Park, they don’t seem to be simply taking in the sights — they’re amassing samples that could reply a few of science’s largest questions: how life survives in excessive environments, how planets turn into liveable and what indicators of life scientists ought to search for past Earth.
Barnes and Debes work with ASU Professor Everett Shock in the Group Exploring Organic Processes in Geochemistry, or GEOPIG Lab. The lab, which research “life as a planetary process,” examines how geology, chemistry and biology work together to make planets liveable.
Barnes, who’s in the School of Molecular Sciences, and Debes, who’s in the School of Earth and Space Exploration, have made many visits to the recent springs in Yellowstone National Park to gather samples for his or her research, which advances GEOPIG’s targets.
While the samples they’re finding out come from the identical supply, they’re individually working to reply totally different questions with the help of specialised devices and employees help on the Metals, Environmental and Terrestrial Analytical Laboratory, or METAL Core, one of many Core Research Facilities.
Finding indicators of life
Barnes’ fascination with science began when he was nonetheless in highschool, with programs that made him see the pure world otherwise. This new perspective sparked a curiosity in astrobiology, the research of life’s potential past Earth.
“What drew me in was a fundamental question: How does life survive and even thrive in environments that seem impossibly hostile?” he says.
Barnes helps scientists acknowledge indicators of life utilizing chemistry by focusing on carbon. Using METAL Core instruments that measure carbon and isotopes, he can research whether or not carbon in Yellowstone samples got here from exterior the recent spring or was produced by the microbes dwelling in it.
Think of separating these two sorts of carbon like finding out water in a swimming pool throughout a rainstorm — which droplets got here from the hose that crammed the pool, and which got here from the clouds?
Being in a position to establish the sources of carbon current in a pattern is vital when rocks in other excessive environments, from Earth to other planets, to find out whether or not the carbon is there by probability or was left behind by life.
“Hiking through one of the most geologically dynamic landscapes on Earth to collect samples and observe these systems up close is a reminder of why I got into this work in the first place,” Barnes says. “Ultimately, the chemistry we uncover in places like Yellowstone will serve as a critical reference point as we begin returning samples from Mars and searching for signs of life on other worlds.”
New power sources for life
Debes’ work seems to be not at what life leaves behind, however at how life would possibly thrive with out daylight or natural matter as an power supply. He research how microbes can survive on power launched by chemical reactions.
With the METAL Core tools, Debes can analyze what chemical substances are in the water, the place that water got here from and what types of power could also be out there to microbes.
Imagine, as an alternative of utilizing photosynthesis or digestion as a supply of power, you could faucet into the chemical change that occurs as metallic rusts. In scorching springs, microbes can benefit from related reactions involving iron and other chemical substances in the water.
Understanding this course of can present scientists the place to search for life in locations like Europa’s ocean, geological formations on Mars or other worlds with water-rock reactions.
Debes has been fascinated by scorching springs since he was younger, however his path to researching them took many twists and turns.
His early research at ASU centered on chemical engineering. He quickly realized that his want to “engineer new chemicals” was not a part of the diploma path he was on and what he actually wished to do was biochemical research.
When he made that change, he seemed for labs doing fascinating work to volunteer in and, when he noticed Shock’s GEOPIG work handled scorching springs, he knew he discovered his new residence.
“The field aspect of research is probably my favorite part of my research career because you get to hike around and see the beautiful hot springs in their natural setting,” he says.
Looked at individually, their work appears extremely specialised. When the outcomes of their experiments are introduced collectively, their joint efforts supply perception into massive questions: How does life survive in excessive environments? How do geology and biology form every other?
The solutions to those questions will supply perception into how life might have began on Earth, and could information other researchers as they search for indicators of it on other planets.
“Field trips (with Shock and GEOPIG) are often where you get inspiration for future research projects as well. Sitting around the campfire after a day of fieldwork and talking about everyone’s observations really gets the creativity flowing and helps everyone frame the scientific questions they are working on,” Debes says.