From: LARRY KLAES (ljk4_at_msn.com)
Date: Tue Nov 09 2004 - 05:11:14 PST
"Exploded Star Possibly Affected Human Evolution"
"A star that exploded about nearly three million years ago left traces of
debris on Earth and might have affected the course of human evolution, a new
study suggests.
When particles from the explosion bombarded Earth's atmosphere over a long
stretch of time, climate change could have forced early humans to fan out in
search of food, the reasoning goes.
The evidence is in the form of extra doses of iron-60, a radioactive isotope
of iron that normally occurs on Earth in lesser quantities. Researchers
found the supernova debris in layers of soil dated to 2.8 million years ago,
building a case they opened five years ago with less concrete data."
Full text:
http://story.news.yahoo.com/news?tmpl=story&u=/space/20041108/sc_space/explodedstarpossiblyaffectedhumanevolution&e=4
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: Tue Nov 09 2004 - 05:28:16 PST