How can you tell if a signal from space is an alien communication?

Humanity scans the skies, hoping to hear from other intelligent species. But how can you be sure you’ve tuned in to aliens and not just got interference? Andy Norton explains.

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Image by Jinterwas under Creative Commins.

Exoplanets and life

We can’t ever claim anything is definitely true, we can only rule out the things that are false and make a hypothesis that something else is true until proved otherwise.

What if you do spot an alien signal?

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