Originally posted by twhitehead
But we only know about dark matter because it exerts a pull via gravity. ๐
I had this completely crazy idea a few weeks ago....I won't even try to defend it and I suspect it's actually impossible, but.... Well I'll just throw it out there.
A long time ago I read about an idea that very, very technologically advanced societies might build a "bubble" around their star, harnessing it's entire energy. I'm not sure exactly how this was supposed to work--perhaps zillions of photovoltaics.
Anyhow, I got to thinking recently, from the discussion of dark matter that I've been hearing about. Wondering if it would be possible that an advanced civilization could develop this technology, and then spread throughout their galaxy, building these "bubbles" and snuffing out the light from ALL of the stars in the galaxy. When they were all done, to an outside observer, would their galaxy then appear to be made of dark matter? Presumably it would still have to radiate energy in the infrared spectrum though...getting rid of the trapped heat. ๐