Nonfiction
Interview: David Brin
If ETs want to contact new tech races, they’re not likely to waste time and resources on gigantic beacons. They’ll know the thousand—or ten thousand, or fifty thousand—life worlds around them that have oxygen atmospheres. But the odds that any one of those has a shiny new civilization will be very small, at any one time. So they’ll just send a ping to each of them, once every hundred years—or maybe once a year—saying, “Is there anybody there yet?” Because that’s cheap to do.






