If you have an interest in the physical properties of space, this is the place for you. Cosmology & astrophysics are sub-fields of astronomy, focusing on the properties of the universe as a whole (cosmology) and the physical or chemical properties of celestial bodies (astrophysics).
One of the most impressive theories of the 20th century, the Big Bang explains the origins of the universe ... at least up to a point. Find out what the theory actually says, what it does not say, and what it may or may not say.
Kepler's Laws describe, in three concise rules, the motion of orbital bodies in the solar system.
A black hole is a curvature of spacetime geometry due to an intense gravitational field. The effects of a black hole are so extreme that even light cannot escape it, thus the name.
Hawking radiation is an explanation of how radiation can be emitted from a black hole, despite its attractive power, due to quantum effects.
The heliocentric model of the universe tells us that the Earth revolves around the sun rather than the other way around. How was this model arrived at? What is the evidence to support it? Why did it take so long to accept?
For more detailed information on space and astronomy, check out the About.com Astronomy Guide.
A number of astronomer biographies are available over at the About.com Space site.
The major popular magazine in the space sciences,
Astronomy provides excellent information for those interested in the physics of space, or those who just like looking with wonder into the night sky.
Eric Weisstein's World of Astronomy is a site full of astronomy information, located on the Wolfram Research website.
This fantastic website on the history of scientific cosmology is maintained by the American Institute of Physics.
Astronomy Now is a popular UK-based astronomy magazine, which features a wide range of content and articles in its online publication.
This journal of astrophysical research publishes abstracts and full papers online.
This is the official website of the National Aeronautics and Space Administration (NASA), which maintains a lot of great information on the space sciences.
This Astronomy Picture of the Day is featured on the NASA website, accompanied by a description of the picture with commentary by a professional astronomer.
