Aided by microbes found in the subarctic conditions of Canada's Hudson Bay, an international team - including researchers from Portugal's Instituto Superior de Agronomia and Tecnico, Canada's Universite Laval in Quebec, and Cornell - has created the first color catalog of icy planet surface signatures to uncover the existence of life in the cosmos.

As ground-based and space telescopes get larger and can probe the atmosphere of rocky exoplanets, astronomers need a color-coded guide to compare them and their moons to vibrant, tinted biological microbes on Earth, which may dominate frozen worlds that circle different stars.

But researchers need to know what microbes that live in frigid places on Earth look like before they can spot them elsewhere.

The study, "Color Catalogue of Life in Ice: Surface Biosignatures on Icy Worlds," published March 15 in the journal Astrobiology, provides this toolkit.

"On Earth, vibrant, biological colors in the Arctic represent signatures of life in small, frozen niches," said lead author Ligia F. Coelho, an astrobiologist and a doctoral student at the faculty laboratories of Zita Martins, Joao Canario and Rodrigo Costa at Tecnico, who grew and measured this frigid, colorful biota at the Carl Sagan Institute at Cornell (CSI).

This summer, Coelho will become a postdoctoral researcher in the lab of Lisa Kaltenegger, professor in the Department of Astronomy and director of CSI in the College of Arts and Sciences.

"The colors from organisms could dominate the whole surface of icy worlds," Coelho said. "Frozen exoplanets are not lost causes. With upcoming telescopes you could find the telltale signs of microbes - if you know what to look for. That's why we've created this catalog."

Coelho collected 80 microorganisms from ice and water at Kuujjuarapik, Quebec, working across the frozen Hudson Bay, obtaining ice cores and drilling holes in the ice to take water samples. She acquired samples at the mouth of the Great Whale River in February 2019, during an excursion in collaboration with a team from Universite Laval, Canada, and logistic support of the Centre d'etude Nordiques (CEN).

"When searching for life in the cosmos, microbes in these frozen plains of the Arctic give us crucial insight of what to look for on cold new worlds," Kaltenegger said, explaining that some of this icy microbial life is well-adapted to the harsh radiation bombardment of space - which can be the norm on distant exoplanets under a red sun.

"Having the right tools to detect life forms on icy worlds is fundamental," said Martins, director of the astrobiology laboratory and professor at Tecnico, who came up with the idea for this research with Kaltenegger. "Our study shows that biosignatures are more intense in drier environments, suggesting that locations that are drier than Earth and contain microbial life forms could represent good targets for future space missions."

After Coelho isolated the microorganisms in Rodrigo Costa's lab (Tecnico), she grew them in upstate New York's relatively balmy climate in the laboratory of Stephen Zinder, professor emeritus of microbiology in the College of Agriculture and Life Sciences. The measurements to find out how these microbes would look to our telescopes were made in the laboratory of William Philpot, professor in the School of Civil and Environmental Engineering.

"Icy environments on Earth show a surprisingly wide diversity of life and might have even provided the environment for life to originate," Coelho said. "The color catalog of life on Earth's subarctic will serve as the guide to search for surface life on icy worlds throughout all the habitable zone, not just in the warm parts."

Said Kaltenegger: "We are assembling the tools to search for life in the universe, so as not to miss it, taking all of Earth's vibrant biosphere into account - even those in the breathtaking chilled places of our Pale Blue Dot."

In addition to Coelho, Kaltenegger, Zinder, Philpot, Jack Madden, Ph.D. '20, Martins, Canario and Costa (Tecnico), M. Gloria Esquivel (ISA) and Warwick Vincent (U. Laval/CEN) were co-authors on the research.

The Carl Sagan Institute and The Brinson Foundation funded this work for the Cornell researchers. Madden, Philpot and Zinder are CSI fellows.

Research Report: "Color Catalogue of Life in Ice: Surface Biosignatures on Icy Worlds"

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