Digest Number 713

On Saturday, September 27, 2003, at 03:09 AM, Michael wrote:

> 1 Ceres (the largest asteroid) makes up more mass than all the other
> asteroids combined and it is not metallic. Neither is 2 pallas, the 3rd
> largest asteroid.
>

Most of the mass of colonies is shielding. It can be anything. The
Ceres example is simply illustriative. Of course, you can get a lot
more material from Earth's Moon.

Space tourism could be our ticket to the stars. Save your pennies,
suborbital flights for $100,000 may start in 2005! See
http://www.spaceadventures.com/suborbital for details.

Al Globus
CSC at NASA Ames Research Center
http://www.nas.nasa.gov/~globus/home.html

Views expressed in this email are only my opinions and are not the
position of any organization I'm familiar with.