"Skybuck Flying" <nospam@hotmail.com> wrote in message news:<cjkrr7$gqf$1@news3.zwoll1.ov.home.nl>...

My idea is to use the SUN as a way to send a message to aliens ;)

We build a big shield around the sun. And then we can turn it on and off
like a lamp.

Yeah... because I don't believe that radio signals would ever get to the
other side of the galaxy... to much noise and stuff... so it's unrecnogzible
blabla whatever :D

So instead one needs a BIG, POWERFULL, SIGNAL ;)

And I think the sun is a pretty good BIG,POWERFULL, SIGNAL ;)

If you've got something catching some large fraction of the light from
the sun, you've got an enormous energy source. Consider the microscopic
fraction of sunlight the Earth catches, and it runs very nearly our
entire culture. (Minor little bits from nuclear, geothermal, and tidal
energy neglected.) If you had something big enough to catch even as
much as 1 percent of the sun's light, you'd have a huge power source,
and could broadcast it in whatever frequency range you chose, so that
it would get through interstellar dust etc. with maximum efficiency.
Indeed, your major problem would be getting rid of the energy you
thus captured.
Socks