If I understand your post correctly, it appears you are making a huge assumption that the only way we notice or recognize phenomena is because the phenomena provides information that can only be the result of an intelligence. Or are you simply defining information as anything we observe?
What information is encoded in the observation of a planets orbital path? If there is any, how do we determine that it is from an intelligence?
"Is it scientifically possible to detect intelligence?
Depending on the definition of intelligence; human like intelligence, yes. Nonhuman intelligence? That is unknown.
By and large it appears you know where I'm coming from. Yes, I make a "huge" assumption, namely that every particle of matter is, and should prove to be, evidence of intelligent design.
Just use a standard definiton of intelligence. I'm not into semantic games. If there is a scientific means of ascertaining the presence of intelligence, what is it?
It is my contention that, if there are any phenomena human reason is able to comprehend, then it was intelligently designed. I do not have a set of hypotheses and tests to satisfy the purist, but I certainly am not about to throw in the towel as if the possibility is totally beyond the realm of scientific endeavor.