If another planet existed that was precisely our size and in our exact orbit, but placed behind the Sun, would we have the means to detect its existence?

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Is it possible that civilizations existed in planets before the birth of

If another planet existed that was precisely our size and in our exact orbit, but placed behind the Sun, would we have the means to detect its existence?

There's probably another planet in our solar system - Laying out two decades of evidence for the mysterious “Planet 9,” a team of astronomers predicts that if it exists, it's likely to

What if Earth shared its orbit with another planet?

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