In the tiny bubble of radius ~130 light-years that we've managed to send radio waves to, maybe. The radius of the observable universe is about 46.5 billion ligh

In the tiny bubble of radius ~130 light-years that we've managed to send radio waves to, maybe. The radius of the observable universe is about 46.5 billion light-years, who knows what else is in there. The ratio between these two numbers is about 1 in 358 million. Saying that we're alone because we haven't heard back after emitting radio waves for only 130 years is like being at a point in space, looking half an inch around us (1.3 cm) in all directions and declaring that Occam's Razor says there's probably nothing within a radius of 2,900 miles (4,650 km). Does that seem reasonable? :-)