Is It Impossible for Us to Understand an Alien Message?

In your paper, you make the argument that this problem might be harder than people anticipate. Why do you believe that it's impossible for us to understand an alien message? I can also addthat this would be true even if the aliens were very similar to us. So just as som thought experiment, imagine that the aliens are actually biologically identical to us, theliens look like humans. But of course, it's very unlikely that they would be identical to us. They get their engine some other way. Other than that, is kind of difficult. Can we guess anything based on the fact that many stars out there are older than our sun?So it might be that other civilizations have had