http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html atmospheric evolution Spre text online http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html Spre text online http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html atmospheric gas retention http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html