Dolphins are a widely distributed and diverse group of fully aquatic marine mammals. They are an informal grouping within the order Cetacea, excluding whales and porpoises, so to zoologists the grouping is paraphyletic. The biggest reason for this is because dolphins’ primary method of communication appears to be verbal.
Since space travel requires a complex understanding of mathematics, that would probably be the way to go. Of course they could communicate telepathically, who knows how that would go. Furthermore, dolphins generally make no attempt to communicate to us at all. Watch how dolphins made a trick to attract fishes as their food.
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(H/T: BBC Earth)