Experts suspect that there are more than a quadrillion exoplanets in our Milky Way alone, about one-fifth of which resemble Earth. In addition to these planets, there are probably another quadrillion rocky moons that are similar in structure to our home.

So how likely is it that we are not alone in this universe? Recently, the alien alarm already rang when researchers spotted a planet right in our closest cosmic neighborhood that looks confusingly similar to Earth.

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