If aliens arrive, how will we talk to them? These experts have some answers
Humans have long been fascinated by extraterrestrial life and particularly intrigued by how aliens might communicate. "Any species which, like us, develops some kind of technological civilisation will have language," Professor Roberts says. "One can't help wondering whether aliens might have evolved a language based on a completely different communication from ours whistles instead of words, images instead of sounds, electrical pulses," he says. While humans primarily use speech, written language and other forms such as sign language, Professor Roberts says this is one of the most uncertain factors to determine. Professor Roberts says it's currently possible for us to potentially establish rudimentary contact with another civilisation, but any genuine communication will rely on language.

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