Yes, probably so, if the means of communication is through light or radio waves. As such, the speed of communication is limited by the speed of light. But it is theoretically possible to contact ETs through telepathic means or lucid dreaming.
Why? Because consciousness pervades the entire universe. So, communication through consciousness is faster than the speed of light. IMO, the Srimad Bhagavatam has given us clues of this type of communication in the story relating to Urvasi, the heavenly apsara. She supposedly can be found taking a bath in the region near the Pleiades, which is placed in beginning degrees of Taurus. From my experience, everyone--perhaps, more so for males--can see Urvasi through lucid dreaming when the Moon is transiting the 3rd quarter of Krittika nakshatra. She appears as a beautiful female during a dream.
