For HS students.     Yoshio Okamoto 17th August 2019
Any comments to yossi.okamoto at_mark gmail.com

These are related links,

Carl Sagan Lecture by Geoffrey W. Marcy at 2011 AGU (American Gephysial Union) Fall Meeting
https://www.youtube.com/watch?v=avjAbQJk4EQ


Today's exercise (original PDF)
https://www.nasa.gov/sites/default/files/atoms/files/tt-apr-13-2011.pdf


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