(Intergalactic travel, on the other hand...)
The simplest to builds seems (currently) to be solar sails; with beamed
energy as a secondary (or even primary) power source. Theoretically: one
could create a kind of highway of beamed energy between two nearby star
systems, along which sailcraft could silently flow; & (assuming an
efficient means of turning stellar energy into a concentrated beam), the
process would essentially run on maintainence only....
All the best,
Robert Clements <Robert.Clements@dva.gov.au>
>Sent: Saturday, May 15, 1999 12:29 AM
>To: Carl Sagan List; email@example.com
>Subject: SETI The assumption
>Being new to this discussion, I will undoubedly raise questions that have
>already been discussed.
>I will certainly use the screen saver, given the choice between flying
>The premise of SETI is that any civilization will eventually discover, use
>emit high frequency signals into the universe. What if this (fact) is merely
>temporary phase for a century or two, followed by discovery of something much
>better? After all, space exploration will require something much faster than
>the speed of light to travel and communicate.
>The search could be for something so rare that discovery is nearly