If you found that article interesting, you might want to read Gregory Benford's "Deep Time" (978-0380975372). Benford was part of the same panel (though in a di

If you found that article interesting, you might want to read Gregory Benford's "Deep Time" (978-0380975372). Benford was part of the same panel (though in a different group), and the first half of the book is in-depth discussion of the various aspects of the problem that they had to consider.