On Earth: Extreme Environments

Overview

Although it sounds like nonsense, one might suggest that the best possibility for "extraterrestrial life" is right here on Earth. Discoveries in the past fifteen years have shown that microscopic life has penetrated environments on this planet that appear most inhospitable.

Nowadays, we look to Life In Extremis on Earth to weight the possibilities of Life off-Earth.

Life in ocean hydrothermal environments
With sunlight only reaching down in the ocean to around 300 feet, who the heck expected to find anything - other than scavengers - alive at two and three *miles* on the cold and dark ocean floor? How about some toxic hydrogen sulfide for dinner?

Life in ocean cold methane environments
If you think the locker-room smells bad, you should get a load of the the tons and tons of methane slowly seeping up from under the ocean floor. Hey, we'll eat *anything*!

Antarctica
Meet the ice-box squad. And how about a lake the size of Lake Ontario *two miles* under the ice? No end to surprises and we haven't even left the Earth yet!!

Microbes in the Earth's Interior
Talk about the hard life. Six thousand feet down, these guys are "rockin." Go eat a granite sandwich?

Hyperthermophiles and other extremophiles
Say what?? - Some like it hot. How does twenty degrees *hotter than boiling* grab you? Or perhaps you'd prefer straight salt, or acid, or lye? Meet the fanatics of Earth life.

General Links

 

Consider the possibilities of Life

In our youths, we peopled the surfaces of Venus and Mars with fantastic creatures, in cloud-shrouded jungles or arid deserts. But our robotic space craft dashed these immature notions and showed us instead planets that looked dead and inhospitable to life.

Is it a reaction to these barren vistas - the manifest absence of life off-earth - that we tend to think that the conditions for life are narrow and specific. That would seem to make sense, wouldn't it? That a planet needs to be such and such distance from its sun, needs to have a thick atmosphere, needs temperatures that stay within such and such a range. And so forth. With conditions for life so specific, it was no wonder that we didn't find sign of it on the barren rocks circling the sun with numbing regularity. How could we truly expect to find it on these remote and barren planets? A fool's quest...

There have been some discoveries right here on Earth, however, in the past decade or so that suggest that this pessimistic view of the possibility of extra-terrestrial life is too rigid. Life exists on the Earth under the most "un-lifelike" conditions.

Consider the forms of anaerobic life, that is, life that does not depend on oxygen. The ability to metabolize and create life-giving energy in non-oxygen environments is now understand to support life miles into the earth itself, into the rock - it is now estimated that the mass of life (primarily bacteria) beneath the Earth's crust is greater (by far) than the mass of life in and on and above the crust.

Life has been found in all temperature extremes.

These discoveries are showing us that life is persistent and downright stubborn when it comes to invading every possible niche on Earth. Toxic gas environment? no problem. Live in pool of acid? you got it. How about inside a rock? can do...

The amazing story of Life in our Inner Space is no less wonderous than the mysteries and marvels of our Outer Space. Perhaps the Key to Life Extraterrestrial is to be found in these hidden places.

Get Extreme!



General Links

 


Ecosystem that thrives without sunlight
"Centipedes, spiders, beetles and crustaceans are just some of the creatures that thrive in the pitch blackness. The base of the food chain in the cave is bacteria, which float in mats on the surface of the cave's water"
.-- Earthsky, 11/17/96

Bizarre Life Forms Thrive Beneath Earth's Surface
"...deep within the planet may be the best place to find new life forms on our planet -- and glean clues to possible life on others ..."
-- Frontiers: The Electronic Newsletter of the National Science Foundation, 8/97

NSF studies life on the edge
"...explore the relationships between organisms and the environments in which they exist. A strong emphasis will be placed on environments that are near the extremes of conditions on Earth. The program will also fund research about our solar system and beyond, to help identify possible new sites for life beyond Earth. "
-- Environmental News Network Daily News, 5/20/97

Deep-sea scientists explore origins of life
"....historic international expedition to the bottom of the sea focused on exploring the
unique biology and geology of volcanic vents along the Mid-Atlantic Ridge...
-- Environmental News Network Daily News, 8/7/97

Life in Extreme Environments
"If life can exist somewhere - it will."
-- Astrobiology Web Links

Phenomena, Comment and Notes
"Life not only thrives in the heat and violence of Earth's submarine volcanoes, it may have started there. And at least one other body in the Solar System just might have eruptions on its ocean floor ..."
-- Smithsonian Magazine, 5/97

Japan Marine Science and Technology Center
Deep-sea research, agency

Life in Extreme Environments
"The National Science Foundation's initiative, Life in Extreme Environments, is designed to bring investigators together from a wide range of fields, from microbiology through volcanology to planetology and it could include chemistry and many other fields in between. "
Japan High-Tech Satellite Network Co., Ltd., NEC Corporation, 6/26/97

Microbes That "Live on the Edge" Focus of Scientific Conference
"Microorganisms can be found living in some of the earth's most hostile places, and scientists will gather in Bozeman next month to talk about how they do it."
--Montana State University Communications Services, 4/29/98

Life in Extreme Environments (NSF)
"The LExEn research program will explore the relationships between organisms and the environments within which they exist, with a strong emphasis upon those life-supporting environments that exist near the extremes of planetary conditions."
-- National Science Foundation, program announcement, 5/18/98

Extremophiles(Scientific American)
"These microbes thrive under conditions that would kill other creatures. The molecules that enable extremophiles to prosper are becoming useful to industry."
-- Scientific American, 4/97

Sea floor observatory set up at volcano
"Tubeworms living in 360 degree Celsius water, snow-blower vents, hydrothermal vents harboring what may be the oldest life form on Earth; these are a few of the things a team of oceanographers were looking for -- and found -- in their quest to establish a sea floor observatory at the Axial Volcano."
-- Environmental News Network, 9/21/98

Key chemical in life creation - ammonia - created at hydrothermal vents
"New high-pressure research by scientists at the Carnegie Institution's Geophysical Laboratory, announced in this week's Nature magazine, reveals that unexpected chemical reactions occur in deep hydrothermal vents of the sea reactions that may have played a key role in the origin of life."
-- Carnegie Institute, 9/23/98

Researchers explore deep sea oil seeps
"Giant tubeworms, mussels, sea fans, brittlestars and other deep-sea creatures live in colonies wherever oil and methane gas seep or bubble from the floor of the Gulf of Mexico. "
-- Environmental News Network, 6/24/98

Rock-eating microbes found nearly a mile beneath the ocean floor
"Scientists at Oregon State University have discovered evidence of rock-eating microbes living nearly a mile beneath the ocean floor in conditions which suggest similar life could exist on Mars or other planets"
-- exosci.com, 8/14/98

Critical reaction thought to support underground microbes now considered unlikely
"This is an important step forward in our continuing efforts to understand the processes that sustain life deep beneath the earth's surface," says Mike Purdy, director of NSF's LeXeN program. "Negative findings like this are as important as positive ones in their importance to our understanding of the processes that determine the limits to life."
-- exosci.com, 8/14/98

Earth microbes on the moon
"The 50-100 organisms survived launch, space vacuum, 3 years of radiation exposure, deep-freeze at an average temperature of only 20 degrees above absolute zero, and no nutrient, water or energy source."
-- Space Science News, 9/1/98

"I always thought the most significant thing that we ever found on the whole...Moon was that little bacteria who came back and lived and nobody ever said [anything] about it."
-- Apollo 12 Commander Pete Conrad, 1991

Researchers Assess Biological Potential Of Mars, Early Earth And Europa
"... modeled geochemical reactions from rock weathering. They also estimated Martian volcanic activity over time and the associated activity of hydrothermal vents."
-- Eukalert, 8/25/98

Eukaryotes in extreme environments
Website
-- Department of Zoology, The Natural History Museum, London, 2/5/98

Life Origins from Undersea Volcano
"An undersea volcano has been discovered in the middle of the Atlantic Ocean which mimics the conditions in which life on earth may have started, scientists said today."
-- ABCnews.com, 9/9/98

Aquarium test helps scientists look for life in extreme environments
"NASA's search for life elsewhere in the solar system is bringing space scientists to the giant kelp forest exhibit at the Monterey Bay Aquarium to test a new scientific probe that might one day look for life in oceans that may exist on Jupiter's icy moon Europa."
-- JPL, 8/20/98