http://www.smh.com.au/news/national/...423496711.html
"One of the pulsars spins on its axis every 22 milliseconds or so, while the other takes about 2.7 seconds, and they both emit powerful radio beams. "They're a bit like lighthouses," Professor Bailes said.
In about 85 million years the two pulsars are expected to smash into each other, producing huge gravitational waves."
also: http://www.sciencemag.org/cgi/content/abstract/1167969
and:
http://techastronomy.com/article.asp?articleid=44901
and:
http://en.wikipedia.org/wiki/PSR_J0737-3039