7 signals from space that could turn out to be aliens

We want aliens to exist. The problem is, most of the places that they could exist are so far away that it would likely take thousands of years to contact them. If we received a radio broadcast from an alien civilization 10,000 light-years away, that means the aliens would have discovered radio broadcasts at least 10,000 years ago. On the heels of this sobering realization, we present seven mysterious signals that might actually be aliens trying to contact us:

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