In sci.physics Uncle Al <UncleAl0@hate.spam.net> wrote:

Skybuck Flying wrote:

Hi,

Seeing all the bullshit in this newsgroup or maybe sci-fi... or maybe future
technology I thought I add some of mine hehehehe.

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.

Won't work.  Shield reaches equilibrium temp and emits.  Who is going
to launch it, NASA?  Ha ha ha.

Do the numbers before you laugh idiotically.
A shield around the sun at the diameter of the earth would reach 
around 0C.

(there are engineering difficulties.)