Is There a Long Standing Alien Civilization?

There seems to be an implicit assumption there that nof their information, their messages, will be incoded in ways that are familiar to us. The fact that they are sending messages coded in electromagnetic radiation of some kind assumes that, you know, the civilization is mathematical or scientific. We're thinking about signals that are almost natural for things that are obviously engineered. But when you begin to think abouta natural you think about maybe a palsar, right? Which has a period is very constant, and then it changes its period. Now we've seen that in the data because there are star quakes on these neutron stars That could well be in our data sets as we search the sky for pol