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?

Could there be planets on the other side of the Sun that we cannot see because the Sun is always in the way? - Quora

Alright I'm a little of confused. Did space and all the planets

I know that we know there is not a planet in Earth's orbit on the

Our Motion Through Space Isn't A Vortex, But Something Far More Interesting

Earth and Mars Were Formed From Collisions of Large Bodies Made of Inner Solar System Material

Exoplanets, Page 39 of 136

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

September 2017 Issue

A donut-shaped planet could theoretically exist. How is this