Physical and Astronomical Constants

 Orbiting Binary Stars

 Astronomy Hyper Text Book

 The Galaxy Gallery: Messier Objects

 Astronomy Picture of the Day Archive

 NASA/IPAC Extragalactic Database

 Space Telescope Science Institute home page

 SDSS home page

  NRAO home page

  ALMA project

 Keck telescope

 CO map of the Galaxy

 Schlegel, Finkbeiner, Davis (ApJ 500, 525) dust map

 Microwave Dust Emission

 Skyview: a virtual observatory

 Introduction to Cosmology

 Geoff Marcy's Planet Search Web Page

  Harvard planet search page

  Sedna: farthest planet in the Solar System

  New planet discovered by microlensing

  Virtual Telescope

 A virtual tour of the Solar System

  Virtual Planet Laboratory

  Star charts and other good stuff

  Wayne Hu's introduction to the microwave background

  Black body radiation

  LBL particle physics tutorials: very useful

 Introduction to Cosmology

  WMAP papers

SDSS redshift diagrams and luminosity function   Redshift diagram to z=0.16  Redshift Diagram to z=0.4  Luminosity Function

 Voyager pictures of the outer planets

 Snowball Earth

 Asteroid impact calculator