This is called the pulsar death line: the point beyond which we stop seeing any pulsars. There's a lot we don't understand about it, but one thing we do know is that 2.9 hours is so far beyond the ...

Frank Drake used 14 pulsars to create a map with our sun at the center. Each pulsar is connected to the sun by a solid line. The length of the line represents the pulsar's approximate relative ...