Is it possible that there is an undiscovered second earth planet on the earth's orbit, just mirrored 180°, so it's impossible to spot from here - as it would always be hidden by the sun?
Or would Voyager space probes and the likes definitely have discovered it already?
Is it possible that there is an undiscovered second earth planet on the earth's orbit, just mirrored 180°, so it's impossible to spot from here - as it would always be hidden by the sun?
Or would Voyager space probes and the likes definitely have discovered it already?