MadSci Network: Environment/Ecology
Query:

Subject: Period of extinction

Date: Wed Sep 25 11:35:12 1996
Posted by: Greg Bear
Grade level: 10-12
School/Organization: Switzerland County High School
City: Vevay State/Province: Indiana
Country: United States
Area of science: Environment/Ecology
Message ID: 843669312.En
Message:
There has been a link between our solar system's revolution around 
the center of the galaxy and global extinction.  How far are we from the next period
of extinction?

Re:Period of extinction

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