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?

The origin of the Solar System

Is it possible for a Planet Zero to exist? - Quora

Earth Is Among the Lucky 1%: The Solar System Follows the Galactic Standard – But It Is a Rare Breed

Newfound black hole may be the closest to Earth

Would it be possible for a planet to exist so close to the sun

Issue October 2017 - Astronomy

Is it possible for a Planet Zero to exist? - Quora

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

Does Earth even exist in the Borderlands universe? where is it? and if it were to ever potentially appear or get referenced what do you guys think it could look like, what

Can a forest planet exist? - Quora

Do planets and suns exist outside of galaxies and if so what would

This solar system of seven Earth-sized planets may be the best place to look for alien life - The Verge