Is Kaku credible?
I have a lot of respect for Kaku. I would like to see the complete transcript of the interview and not just (postulating here) a bunch of cherry picked quotes to write an article that is exciting.
If I wasn't on my iphone I would highlight some key phrases like might, could be, right out of sci-fi.
Kaku is a theoretical physicist that esposuses the various types of civilizations. He hasn't had the chance to read the studies and he is not an astrophysicist. It appears to me that he is postulating things that could be, not based on data. I'm telling you that they still do not have the full spectrum captured and have plans to truly and do that. I think it will be a long time before we ever know what it even could be, let alone what it is.