In recitation sections on November 7/10 you will participate in this debate to try and settle the matter - for Astro 120, at least. . . Homework 9 will prepare you for the discussion - it is a bit different than the previous homeworks, so click on the link there, print it out, and then read this item again.
You are to fill out the 'pre-debate' questions and hand it in during recitation on November 7 or 10.
For background reading, use your text but also check out a selection of the following links about the new discoveries, and the debate that rages on:
and be sure to read up on the discussion from a few years ago by checking out these links as well.