06-07-2015, 06:58 AM
(This post was last modified: 06-07-2015, 06:59 AM by stevebowers.)
Yes. Alexander Zaitsev pointed out several years ago that asteroid radar would be visible over hundreds of light years, even using our receivers. Of course this might be just another peryton.
http://en.wikipedia.org/wiki/Peryton_%28Astronomy%29
http://en.wikipedia.org/wiki/Peryton_%28Astronomy%29