Astronomy.

I’ve included links to general astronomically-related links here, as well as links to sites that detail the names and meanings of astronomical objects. I figure they fit better in this category than they do in the "Names" category.

 
Title: Absolute Astronomy
Notes: Excellent source for basic astronomy information.
 
Title: The Electronic Sky
Notes: Another source for basic astronomy information.
 
Title: The Constellations and their Stars
Notes: Excellent resource guide to heavenly bodies.
 
Title: Astronomy Picture of the Day
Notes: A high-quality picture relating to astronomy for each day, along with information regarding the picture. A lot of inspiration can be found in the right picture.
 
Title: Wikipedia - Lists of Astronomical Objects

 
Title: Wikipedia - Meanings of Asteroid Names
Notes: Rarely gives true meanings to the names of the asteroids, instead most often just giving the sources of the names. Still, an interesting resource.
 
Title: Minor Planet Names
Notes: A list of all of the named asteroids and minor planets in our solar system. Kept well up-to-date.
 
Title: Maori Star and Constellation Names
Notes: The names that several tribes of the Maori people called the stars. I wish I could find more sites like this.
 
Title: Vedic Astronomy
Notes: Names and mythology of the stars from the Indian culture. Very informative.
 
Title: Indian Star Names

 

Mars Theory.

"Mars Theory" refers to speculation on the ancient geology and possible archaeology of Mars. Mars theory often degenerates into conspiracy theory, unfortunately, so some of the links may be a little too "out there".
 
 
Title: The Cydonia Controversy
Notes: A historical and scientific look at the claims of archaeological sites on Mars.
 
Title: The "Face on Mars"
Notes: Scientific data on the "Face on Mars" geographical anomaly.
 
Title: The Martian Enigmas
Notes: Scientific articles covering the "Face" and "Pyramids" on Mars.
 
Title: Mars – Mysteries of the Red Planet
Notes: Image archive of the purported archaeological mysteries of Mars.
 
Title: The Mars-Earth Connection
Notes: Collection of paranormal-slanted articles dealing with the mysteries of Mars.
 
Title: Mars Anomalies
Notes: Paranormal-slanted articles regarding the anomalies and mysteries of Mars.