A star-filled sky is as mysterious as it is sublime. What are we looking at? How far away and from when?! How do I tell the Little Dipper from the Big Dipper? Is that Cassiopeia or Orion? Is the moon waxing or waning? Whether you''re an occasional backyard stargazer or would-be astrophysicist, you ll find pages of useful information in the Observer's Notebook: Astronomy. Stunning four-color images from the Hubble and ESA space telescopes are interweaved with ruled pages for your own celestial observations, notes, and star-based wishes.