Life on the Edge
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Life on the Edge A hands-on experiment for students to learn about
life in extreme environments begins this week at 14,249 ft.
Jan. 13, 1999: NASA scientists are joining forces with
researchers from the Center for Astrophysical Research in Antarctica
and the University of California's White Mountain Research Station
to conduct a unique educational activity in microbiology. It's
a hands-on experiment designed for students of all ages to investigate
life in extreme environments and to learn about the possibilities
for life elsewhere in the Solar System.
In recent years scientists have begun to recognize that certain life forms on Earth can thrive under very extreme conditions. Viable microorganisms have been found living in acidic hot springs, buried under ancient permafrost, and even inside volcanic rocks.
Left: These hot springs at Yellowstone owe their vibrant colors to thermophilic (heat-loving) microorganisms, many of which can live and reproduce at temperatures near the boiling point of water. Photo courtesy Prof. Thomas D. Brock, University of Wisconsin.
Perhaps the most astonishing survivor of extreme living conditions is the common bacteria Streptococus mitis. Unknown to mission planners in 1967 a small colony of Streptococus bacteria traveled to the moon aboard Surveyor 3, stowed away inside the spacecraft's TV camera. Three years later when Apollo 12 astronauts returned the camera to Earth, scientists were astonished to find that the bacteria were viable. They had survived 3 years of hard vacuum, with no food or water. In 1991 Apollo 12 commander Pete Conrad commented "I always thought the most significant thing we ever found on the whole...Moon was that little bacteria who came back and lived...."
The discovery of things living in extreme environments has clearly changed our understanding of life and where it might be found. Places like the polar caps of Mars or oceans on Jupiter's moons were once thought to be too extreme for life, but many scientists are now reexamining that conventional wisdom. Extreme-loving bacteria and other organisms ("extremophiles") are showing scientists that there is a surprising range of conditions where basic life forms can set up housekeeping.
This month scientists will launch a program called Life on
the Edge designed to bring the concepts of life in extreme
environments to classrooms everywhere. "The basic idea,"
says Dr. David Noever, a member of NASA/Marshall's astrobiology
research group, "is to expose a collection of microorganisms
to some of Earth's harshest environments, including geothermal
vents, high mountain peaks, and even the South Pole. We plan
to distribute the microbes to US classrooms where students can
perform experiments to see how well they fared. The microbes
would come with an 'Extremophiles Experimenter's Kit' containing
all the basic ingredients a student might need to investigate
how well the microbes survived their experience."
Above: Samples of candidate microbes found by Richard Hoover (NASA/Marshall) and Dr. S.S. Abyzov (Institute of Microbiology) in deep ice from the Antarctic. Hoover, who is a member of the NASA Astrobiology Institute, and his colleagues are using NASA/Marshall's Scanning Electron Microscope (ESEM) to investigate preserved microbes in Antarctic ice cores. Full Story
What is Life on the
Edge? Why study life in extreme environments? How do I become
Students would apply simple laboratory protocols to assess the effects of severe conditions on their microbe samples, and to learn how these conditions compare with environments elsewhere in the solar system, such as Europa, the Moon, and Mars. "The exact contents of the Experimenter's Kit are still up in the air," continued Noever, "and there are many candidate micro-organisms for this experiment, including yeasts native to Antarctica, bacteria from Russian volcanoes, and others. We have to decide which microbes are going to work best in the field and in the classroom. That's the purpose of the White Mountain activity."
Step One -- The White Mountain Summit
The first phase of Life on the Edge begins next week when
Dr. Tony Phillips and a team of 8 Siberian Huskies will transport
a 50 lb container of test microbes to the summit of the White
Mountain Range in central California. Conditions there are severe.
At 14,249 ft., the air pressure is only 600 millibars, and the
sustained temperature during winter is a frigid -20 C. Annual
precipitation is less than 12 inches, most of which arrives as
snow in winter. The temperature, pressure, and low humidity are
similar to conditions at Earth's south pole during the austral
Above: The White Mountain summit reaches a dizzying 14,249 ft above sea level. This picture taken in the spring of 1996 shows the White Mountain Summit Research Facility, a tiny stone building barely visible in the distance at the summit's highest point. The Life on the Edge microbe vessel will be located a short distance from the Research Facility. Photo courtesy White Mountain Research Station. Larger image.
The microbes will be situated at the White Mountain summit during the 3 harshest months of the Northern winter, and then returned for testing in early May 1999. Most of the micro-organisms will be members of the family saccharomyces cerevisiae, better known as baker's yeast. Saccharomyces cerevisiae is one of the half-dozen microbes on Earth whose genetic script has been comprehensively deciphered. Notable in the yeast gene is a host of signals called thermal shock proteins that trigger the microbe to protect itself against extremes in heat and cold.
looking for a few good volunteers|
Next month we'll be inviting educators, students, and other scientists to join us as participants in Life on the Edge. If you have an interest in learning about life in extreme environments, you'll be able to sign up to receive a sample packet of microbes returned from the White Mountain summit. What's it cost? Nothing! We'll simply ask that you try out some of our classroom-safe lab protocols and give us your feedback. If you're interested please sign up for our Partners in Discovery program.
The Life on the Edge project is conducted with support from the NASA Marshall Education Programs Office.
Two types of containers will be used. One will place the microbes
in thermal contact with the environment, but isolate them from
other factors like wind, snow, and competing life forms. A second
type of container will expose the microbes as fully as possible
to their surroundings, without actually releasing them into the
environment. These "full exposure" vessels will provide
the most realistic test of life in extreme conditions.
Joining baker's yeast in the microbe containers will be a collection of other benign, but extremophilic microorganisms:
- Aquaspirillum arcticum: a bacteria found under snow and ice in the Canadian Northwest territory that produces cold-shock proteins and cold-acclimation proteins
- Candida Antarctica: an alkali-tolerant yeast hailing from Lake Vanda, Antarctica
- Desulfurella acetivorans: an anaerobic bacterium discovered in the Russian volcano Uzan on the Kamchatka Peninsula.
- Saccharomyces cerevisiae Hansen: a radiation-tolerant strain of Baker's yeast that can survive in the core of a nuclear reactor.
- Shewanella benthica: a high pressure bacteria discovered living in the Puerto Rico trench.
- Halobacterium halobium: a salt-loving extremophile from the Owens Dry Lake in California
All of the organisms listed above have the best possible biosafety rating as determined by the American Type Culture Collection.After the microbes are recovered in May they will be flown to the NASA/Marshall Space Sciences Laboratory. There, researchers will evaluate the design of the microbe containers and examine the microbes themselves to see how well they endured winter conditions at the summit. The experience gained at the White Mountain summit will be invaluable for planning future Life on the Edge expeditions to Alaska, the South Pole, and other frigid, high altitude environments.
Left: Lead Dogs of Science. Tovic (right) and Blue (left) rest between training runs in the Inyo National Forest. Tovic and Blue will lead a team of 8 Siberian Huskies and one astronomer on an arduous journey to the White Mountain Summit at 14,249 ft., where they will place a 50 lb container full of yeast and other extremophiles. Tovic and Blue have two years experience as lead dogs. This will be their first scientific expedition.
NASA Science News will cover the expedition to the White Mountain summit as it progresses. The journey is set to begin this week.
Life on the Edge is a collaborative educational project being developed between NASA/Marshall Space Science Laboratory, the Center for Astrophysical Research in Antarctica (CARA), and the University of California White Mountain Research Station (WMRS). Participants include David Noever, Richard Hoover, Tony Phillips, John Horack, and Dale Watring of NASA; Randy Landsberg of CARA; Joe Szewczak and Susan Szewczak of the WMRS.Web Links
The White Mountain Research Station - from the University of California
The Center for Astrophysical research in Antarctica -- from the University of Chicago and Comets web site
The Star Trails Society - join NASA as a partner in Discovery
SouthPole.com - The South Pole Adventure Web Page
NASA/Ames Astrobiology Web Site -- something for everyone interested in astrobiology
NASA's Office of Space Science - press releases and other news related to NASA and astrophysics
3 Dec. 1998: The frosty plains of Europa -- new evidence for water
on Jupiter's moon.
22 Oct. 1998: Callisto makes a big splash -- Scientists may have discovered a salty ocean and some ingredients for life on Jupiter's moon
16 Sep. 1998: Great Bugs of Fire -- NASA sends volcano-loving microbes into orbit for materials science research.
1 Sep. 1998: Earth microbes on the Moon -- Three decades after Apollo 12, a remarkable colony of lunar survivors revisited.
12 Mar. 1998:
Exotic-looking microbes turn up in ancient Antarctic ice -- microbes in the ice above Lake Vostok
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