So Arizona State University physicist and astrobiologist Paul Davies says we might not be hearing alien civilizations because they have transcended their broadcasting stage.

VOA: standard.2010.04.16

"They turned this fort into a camp for Germans and German alien citizens, German nationals and Japanese and Japanese-American citizens, and some other nationalities."

VOA: standard.2010.06.22

which reviews the search for alien life and suggests ways to broaden the quest.

VOA: standard.2010.04.16

Or maybe,instead of a radio signal, an alien civilization sent us something physical.

VOA: standard.2010.04.16

Fifty years ago this week, a young Cornell University scientist named Frank Drake pointed a radio telescope at a distant star, hoping to hear transmissions from an alien civilization.

VOA: standard.2010.04.16

"This kind of thing" included the incarceration of 1,800 Japanese,1,500 Germans, as well as smaller numbers of Italians and other Europeans at Fort Lincoln during the war years, under the Alien Enemy Control Program.

VOA: standard.2010.06.22

"There seems to be a growing recognition that the Taliban and other miscreants, to use the Pakistanis' own word for this,are a threat to the entire country and are alien to the spirit of Mohammed Ali Jinnah and the founders of Pakistan."

VOA: standard.2009.09.24

"We could look for beacons." "It could be that there are alien civilizations that have simply created something a little bit like a lighthouse that sweeps the plane of the galaxy, goes bleep, and it's there to attract attention, or it's a monument, or an aesthetic symbol or even a religious symbol.

VOA: standard.2010.04.16