Air and Space

The Aerospace Navigator has many good links. So does Universe Today; it includes current news about many aspects of space.

Images

The Center for Mars Exploration with many pix and some info about past and present missions. Note that "Mars Images and Meteorology" points to a page with gigantic images, sizes not given. The "Viking Orbiter Image Archive" starts with a giant picture but then issues small ones at high res ( < 400 m/pxl). "Other Images" has some pretty ones, as does "Surface Images". Under "Mars Tools", look for:
Mars Multi-Scale Map by Calvin Hamilton and friends at Los Alamos. Images take a minute or more at 28.8; it reverts to 512x512 even when you select 256x256, and uses more than 200 grey levels. But see also Kanef's
Atlas of Mars where you can get images as small as 100k, displayed in 3x3 tiles, using only 16 grey levels, from the Global Map
Clementine moon pix. Some of the GIFs are gigantic; preview sizes of the Selected Images. The image browser is neat and sends images as small as 60k bytes (if you choose 256x256 pixels).
Seeing the Earth in 3D Through Imaging Radar
Earth from space; you specify lat & long. Generated image can be sizable, but even so, pixel size is in the tens of miles, I think. So use Google Earth instead.

Launchers and propulsion

Some of these links may be out of date. A good summary of the more promising launcher development efforts going on these days is to be found at Space Future, with links to the sites of the companies doing the work. See also HobbySpace and my own notes from the Space Access '05 convention.

Organisations

The good guys: Space Access Society
Some pretty good guys: the X-Prize Foundation.
The not-so-good guys: NASA's Exploration Division incl "Beyond LEO" newsletter with some pretty good articles
The optimists: InterGlobal Space Lines
Some other guys: I used to have a link here to the Artemis Society, but they didn't like the way I described them. Rather than risk a lawsuit, I removed it, because I'm certainly not going to let them dictate what I say here.

I also have a list of pressure groups who are trying to get access to space at reasonable prices (no, not by asking the government to absorb 90% of the cost!), startup companies, and the like. It overlaps with what's on this page. Sorry.

other

A US Air Force research paper on defending the Earth against stray asteroids, comets, etc. -- goes into detail about what can, might, and should be done.
George Herbert on Mars Suits
a "Basics of Space Flight" course
SP-100 for lunar applications
Lunar/Martian materials extraction
various NASA stuff: acronyms, and links to many scientific space missions
A "controversy" Space FAQ by Jonathan Leech -- a bunch of stuff like Shuttle costs, Saturn V plans, RTGs, humans in vacuo.
markets in space, by Jim Kingdon, condensed from the CSTS (14k)
FAQ for sci.space.*
partial archive for sci.space.tech -- really hard to get through, 31 July 1996

Richard Treitel his page