Melvyn Bragg and guests discuss extremophiles, the organisms thriving in very harsh conditions on Earth and providing clues to life forms on other planets.
In 1977, scientists in the submersible "Alvin" were exploring the deep ocean bed off the Galapagos Islands. In the dark, they discovered hydrothermal vents, like chimneys, from which superheated water flowed. Around the vents there was an extraordinary variety of life, feeding on microbes which were thriving in the acidity and extreme temperature of the vents. While it was already known that some microbes are extremophiles, thriving in extreme conditions, such as the springs and geysers of Yellowstone Park (pictured), that had not prepared scientists for what they now found. Since the "Alvin" discovery, the increased study of extremophile microbes has revealed much about what is and is not needed to sustain life on Earth and given rise to new theories about how and where life began. It has also suggested forms and places in which life might be found elsewhere in the Universe.
Professor of Planetary and Space Sciences at the Open University
Professor of Planetary Science and Astrobiology at Birkbeck University of London
Reader in Evolutionary Biochemistry at University College London
Producer: Simon Tillotson.
LINKS AND FURTHER READING
Lewis Dartnell, Life in the Universe (Oneworld Publications, 2007)
Cindy Lee Van Dover, The Ecology of Deep-Sea Hydrothermal Vents (Princeton University Press, 2000)
Franklin M. Harold, In Search of Cell History: The Evolution of Life's Building Blocks (University of Chicago Press, 2014)
Andrew H. Knoll, Life on a Young Planet: The First Three Billion Years of Evolution on Earth (Princeton University Press, 2003)
Nick Lane, The Vital Question: Why is life the way it is? (Profile Books, 2015)
Woodruff T. Sullivan and John A. Baross (eds.), Planets and Life: The Emerging Science of Astrobiology (Cambridge University Press, 2007)
David A. Wharton, Life at the Limits: Organisms in Extreme Environments (Cambridge University Press, 2002)
|Interviewed Guest||Monica Grady|
|Interviewed Guest||Ian Crawford|
|Interviewed Guest||Nick Lane|