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?

Caltech Researchers Find Evidence of a Real Ninth Planet

Seeing the Earth through alien eyes: an extraterrestrial view of our planet – Physics World

Discovery Alert: The Planet that Shouldn't Be There – Exoplanet Exploration: Planets Beyond our Solar System

Exoplanets, Page 39 of 136

If another planet existed that was precisely our size and in our

Does physics allow the existence of a square planet? - Quora

What Would Life on Other Planets Look Like?

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

How Are Planets Made? New Theories Are Taking Shape.

How would a planet actually exist that is made up solely of liquid