Black holes and wormholes are fascinating theoretical concepts within the realm of general relativity, but their practical realization and utilization for intergalactic communication or travel pose numerous challenges. We have yet to develop a comprehensive theory that unifies general relativity (describing gravity on large scales) with quantum mechanics (describing phenomena on small scales).
Additionally, the formation and control of black holes and wormholes, as well as the transfer of information through them, involve several hypothetical and highly complex processes that are not currently feasible or well-understood. The nature of black holes, including their extreme gravitational forces and singularities, presents significant obstacles for manipulating or interacting with them.
Furthermore, intergalactic communication and travel involve immense distances and timescales, making it extremely challenging to establish real-time connections or undertake practical journeys to other galaxies. The vastness of space, the limitations of the speed of light, and the energy requirements pose formidable obstacles to intergalactic exploration and communication.
While scientific progress continues to expand our knowledge and technological capabilities, it is essential to recognize the limitations of our current understanding and the tremendous challenges involved in concepts like intergalactic communication and travel. They remain subjects of speculative science fiction rather than achievable realities at present.