Content with the tag: “bifs”
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New Evidence Challenges Oldest Signs of Life
A photograph of an outcrop of metamorphosed volcanosedimentary rocks from the Porpoise Cove locality, Nuvvuagittuq supracrustal belt, Canada. Image: Mojzsis et. al. / NASA Astrobiology
Ancient rocks are shedding new light on the timeline for life’s emergence on Earth. The rocks from the Nuvvuagittuq Supracrustal Belt in Quebec, Canada, are believed to be some of the oldest on Earth. They contain carbon-based minerals that had been interpreted as evidence of the Earth’s early biosphere. However, new research funded in part by the NASA Exo/Evo and NAI programs tells a different story. By applying cutting-edge technology to the rocks samples, a team of scientists have revealed that the carbon minerals found in the rocks may be much younger than the...Source: [Boston College]
May 25, 2011 / Posted by: Aaron Gronstal
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Battle of the Bands
Banded rocks scattered across the upper Midwest and elsewhere around the world were once mined as a source of iron. Now these rocks are providing astrobiologists with information about the environment of the early Earth. Research supported by the NASA Astrobiology Institute is helping scientists determine information about the geochemical conditions that existed on Earth more than 2 billion years ago.Source: [astrobio.net]
October 17, 2009 / Posted by: Aaron Gronstal
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