Question:
Could someone talk to ET's across the galaxies?
Answer:
This is possible, as telepathy has no distance limitations. But I don't think this would be a practical undertaking unless the communicator personally knew the ET in question, or vice versa.* Otherwise, this would be like trying to telepathically communicate with the entire population of the universe simultaneously.* Some method of attunement would be required to cause such a telepathic connection.