Astronomy

The Mahalo Top 7

1. Official Site: International Astronomical Union (IAU)
2. Wikipedia: Astronomy | Astronomy Portal
3. NASA: Astronomy Picture of the Day (APOD) | Science@NASA: Astronomy
4. HubbleSite: Explore Astronomy
5. Official Site: SETI Institute
6. Wolfram Research: Eric Weisstein's World of Astronomy
7. Official Site: Space Telescope Science Institute (STScI)

Astronomy Recent News

• Astronomy Magazine
• Google News: Astronomy
• BBC News: Trio of 'super-Earths' discovered (June 16, 2008)
• BBC News: Astronomers See 'Youngest Planet' (April 2, 2008)
• Globalandmail: Super-Sized Boom Coming For Telescopes (February 3, 2008) 
• NASA: Christmas Eve Sky Show (December 20, 2007)
• ABC News: "Scientists to Shut Down Space Telescope" (2007) 
• NASA: "NASA to Announce Work Assignments to Enable Lunar Exploration" (2007)

Astronomy History

• Wikipedia: History of Astronomy
• National Radio Astronomy Observatory: History of Radio Astronomy
• Chandra X-ray Observatory: History of X-ray Astronomy
• Project Gutenberg: History of Astronomy by George Forbes
• NASA's HEASARC: A Brief History of High-Energy Astronomy
• Windows to the Universe: Astronomy Throughout History

Notable Figures in Astronomy

• Wikipedia: List of astronomers

Ancient History

• Tufts University: Aristarchus
• University of Cambridge: Hipparchus
• University of St Andrews: Claudius Ptolemy
• Center for Spatially Integrated Social Science: Claudius Ptolemaeus (Ptolemy)

Middle Ages

• Wolfram Research: Nicholaus Copernicus (1473-1543)
• NASA: Johannes Kepler
• The Galileo Project: Galileo's Biography
• University of St Andrews: Edmund Halley
• TychoBrahe.com: The Astronomer Tycho Brahe Information 

Modern Days

• The Following Links are to Wikipedia:
• Albert Einstein
• Edwin Hubble
• Carl Sagan
• George Ogden Abell
• Bohdan Paczynski

Astronomy Fun Stuff

• GalaxyZoo.org: Help Classify A Million Galaxies 
• Exploratorium.edu: Your Age On Other Worlds  
• Astronomy!: Astronomy Fun
• Space Camp
• NASA: Mars Viewing Tips for 2007

Astronomy Research

• Sloan Digital Sky Survey: SDSS Sky Server Data Release 6
• University of Texas: Astronomy Research
• University of Hawaii's Institute for Astronomy: Research at the IfA
• NASA's HEASARC: High Energy Astrophysics Science Archive Research Center
• The Monterey Institute for Research in Astronomy
• The Southeastern Association for Research in Astronomy
• Association of Universities for Research in Astronomy
• International Astronomical Union (IAU)

Astronomy Education Resources

• Infrared Processing and Analysis Center: Cool Cosmos
• Tufts University: Cosmic Evolution - From Big Bang to Humankind  
• StarChild: A Learning Center for Young Astronomers
• The Astronomy Cafe: 61 FAQs about A Career in Astronomy
• The Center for Science Education at UC Berkley: At Home Astronomy
• NASA: The Space Place
• Cornell University: Curious About Astronomy? Ask an Astronomer
• Amazing Space: Astronomy Basics

Astronomy Magazines

• Sky and Telescope: Astronomy Magazine
• Astronomy.com: Astronomy Magazine
• BBC Sky at Night: Astronomy Magazine
• New Scientist Space: Online Astronomy Magazine

Astronomy Photos

• NASA: Planetary Photojournal | Astronomy Picture of the Day Archive
• HubbleSite: Image Gallery
• Malin Space Science Systems: Mars Images from NASA Orbiters
• Flickr: Astronomy Slideshow
• Google Image Search: Astronomy Images

Astronomy Videos

• AstroShorts: Astronomy How To - Observing Meteor Showers (Time: 5:16)
• Space.com: Astronomy Videos
• American Institute of Physics: Black Holes Light Up (Time: 1:21)
• Google Video: Astronomy Lecture 1: What is a Star? (Time: 1:02:02)

Astronomy Blogs

• Universe Today: Astronomy Blog 
• MSNBC: Cosmic Log
• Slacker Astronomy: Astronomy Blog
• Rayben's Systems, Inc: Vern's Astronomy Weblog
• BadAstronomy
• Universe Today: Astronomy and Space Blog

Astronomy Forums

• Astronomy.com: Astronomy Forum
• Bad Astronomy and Universe Today Forum
• Cloudy Nights Telescope Review: Science of Astronomy & Space Exploration Forum

Astronomy Organizations and Societies

• American Association of Variable Star Observers (AAVSO)
• European Organization for Astronomical Research in the Southern Hemisphere (ESO)
• American Astronomical Society (AAS)
• 2009, International Year of Astronomy (IYA2009)

Astronomy Books and Publications

• Amazon.com: Astronomy Books | Astronomy Dvd's | Astronomy Toys and Games
• Barnes & Noble: Astronomy Books | Astronomy Dvd's | Astronomy Toys and Games
• Powells.com: Astronomy Books
• Google Book Search: Astronomy

Astronomy Theories

• The Galileo Project: Copernican System | Atomism | On Motion
• Wikipedia: Heliocentrism
• Bluffton University: Models of the Solar System
• National Oceanic and Atmospheric Administration (NOAA): Astronomical Theory of Climate Change
• University of St Andrews: Ptolemy's Hypotheses on Astronomy